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Request Parameters

Here's the reference information for the request parameters.

These are the special functions that you can put in path operation function parameters or dependency functions with Annotated to get data from the request.

It includes:

  • Query()
  • Path()
  • Body()
  • Cookie()
  • Header()
  • Form()
  • File()

You can import them all directly from fastapi:

from fastapi import Body, Cookie, File, Form, Header, Path, Query
Query(
    default=Undefined,
    *,
    default_factory=_Unset,
    alias=None,
    alias_priority=_Unset,
    validation_alias=None,
    serialization_alias=None,
    title=None,
    description=None,
    gt=None,
    ge=None,
    lt=None,
    le=None,
    min_length=None,
    max_length=None,
    pattern=None,
    regex=None,
    discriminator=None,
    strict=_Unset,
    multiple_of=_Unset,
    allow_inf_nan=_Unset,
    max_digits=_Unset,
    decimal_places=_Unset,
    examples=None,
    example=_Unset,
    openapi_examples=None,
    deprecated=None,
    include_in_schema=True,
    json_schema_extra=None,
    **extra
)
PARAMETER DESCRIPTION
default Default value if the parameter field is not set. Read more about it in the FastAPI docs about Query parameters TYPE: Any DEFAULT: Undefined
default_factory A callable to generate the default value. This doesn't affect Path parameters as the value is always required. The parameter is available only for compatibility. TYPE: Callable[[], Any] | None DEFAULT: _Unset
alias An alternative name for the parameter field. This will be used to extract the data and for the generated OpenAPI. It is particularly useful when you can't use the name you want because it is a Python reserved keyword or similar. Read more about it in the FastAPI docs about Query parameters TYPE: str | None DEFAULT: None
alias_priority Priority of the alias. This affects whether an alias generator is used. TYPE: int | None DEFAULT: _Unset
validation_alias 'Whitelist' validation step. The parameter field will be the single one allowed by the alias or set of aliases defined. TYPE: str | AliasPath | AliasChoices | None DEFAULT: None
serialization_alias 'Blacklist' validation step. The vanilla parameter field will be the single one of the alias' or set of aliases' fields and all the other fields will be ignored at serialization time. TYPE: str | None DEFAULT: None
title Human-readable title. Read more about it in the FastAPI docs about Query parameters TYPE: str | None DEFAULT: None
description Human-readable description. Read more about it in the FastAPI docs about Query parameters TYPE: str | None DEFAULT: None
gt Greater than. If set, value must be greater than this. Only applicable to numbers. Read more about it in the FastAPI docs about Path parameters numeric validations TYPE: float | None DEFAULT: None
ge Greater than or equal. If set, value must be greater than or equal to this. Only applicable to numbers. Read more about it in the FastAPI docs about Path parameters numeric validations TYPE: float | None DEFAULT: None
lt Less than. If set, value must be less than this. Only applicable to numbers. Read more about it in the FastAPI docs about Path parameters numeric validations TYPE: float | None DEFAULT: None
le Less than or equal. If set, value must be less than or equal to this. Only applicable to numbers. Read more about it in the FastAPI docs about Path parameters numeric validations TYPE: float | None DEFAULT: None
min_length Minimum length for strings. Read more about it in the FastAPI docs about Query parameters TYPE: int | None DEFAULT: None
max_length Maximum length for strings. Read more about it in the FastAPI docs about Query parameters TYPE: int | None DEFAULT: None
pattern RegEx pattern for strings. Read more about it in the [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#add-regular-expressions TYPE: str | None DEFAULT: None
regex Deprecated in FastAPI 0.100.0 and Pydantic v2, use pattern instead. RegEx pattern for strings. TYPE: str | None DEFAULT: None
discriminator Parameter field name for discriminating the type in a tagged union. TYPE: str | None DEFAULT: None
strict If True, strict validation is applied to the field. TYPE: bool | None DEFAULT: _Unset
multiple_of Value must be a multiple of this. Only applicable to numbers. TYPE: float | None DEFAULT: _Unset
allow_inf_nan Allow inf, -inf, nan. Only applicable to numbers. TYPE: bool | None DEFAULT: _Unset
max_digits Maximum number of digits allowed for decimal values. TYPE: int | None DEFAULT: _Unset
decimal_places Maximum number of decimal places allowed for decimal values. TYPE: int | None DEFAULT: _Unset
examples Example values for this field. Read more about it in the FastAPI docs for Declare Request Example Data TYPE: list[Any] | None DEFAULT: None
example Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, although still supported. Use examples instead. TYPE: Any | None DEFAULT: _Unset
openapi_examples OpenAPI-specific examples. It will be added to the generated OpenAPI (e.g. visible at /docs). Swagger UI (that provides the /docs interface) has better support for the OpenAPI-specific examples than the JSON Schema examples, that's the main use case for this. Read more about it in the FastAPI docs for Declare Request Example Data. TYPE: dict[str, Example] | None DEFAULT: None
deprecated Mark this parameter field as deprecated. It will affect the generated OpenAPI (e.g. visible at /docs). Read more about it in the FastAPI docs about Query parameters TYPE: deprecated | str | bool | None DEFAULT: None
include_in_schema To include (or not) this parameter field in the generated OpenAPI. You probably don't need it, but it's available. This affects the generated OpenAPI (e.g. visible at /docs). Read more about it in the [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#exclude-parameters-from-openapi TYPE: bool DEFAULT: True
json_schema_extra Any additional JSON schema data. TYPE: dict[str, Any] | None DEFAULT: None
**extra The extra kwargs is deprecated. Use json_schema_extra instead. Include extra fields used by the JSON Schema. TYPE: Any DEFAULT: {}
Source code in fastapi/param_functions.py
def Query(  # noqa: N802
    default: Annotated[
        Any,
        Doc(
            """
            Default value if the parameter field is not set.

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#alternative-old-query-as-the-default-value)
            """
        ),
    ] = Undefined,
    *,
    default_factory: Annotated[
        Callable[[], Any] | None,
        Doc(
            """
            A callable to generate the default value.

            This doesn't affect `Path` parameters as the value is always required.
            The parameter is available only for compatibility.
            """
        ),
    ] = _Unset,
    alias: Annotated[
        str | None,
        Doc(
            """
            An alternative name for the parameter field.

            This will be used to extract the data and for the generated OpenAPI.
            It is particularly useful when you can't use the name you want because it
            is a Python reserved keyword or similar.

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#alias-parameters)
            """
        ),
    ] = None,
    alias_priority: Annotated[
        int | None,
        Doc(
            """
            Priority of the alias. This affects whether an alias generator is used.
            """
        ),
    ] = _Unset,
    validation_alias: Annotated[
        str | AliasPath | AliasChoices | None,
        Doc(
            """
            'Whitelist' validation step. The parameter field will be the single one
            allowed by the alias or set of aliases defined.
            """
        ),
    ] = None,
    serialization_alias: Annotated[
        str | None,
        Doc(
            """
            'Blacklist' validation step. The vanilla parameter field will be the
            single one of the alias' or set of aliases' fields and all the other
            fields will be ignored at serialization time.
            """
        ),
    ] = None,
    title: Annotated[
        str | None,
        Doc(
            """
            Human-readable title.

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#declare-more-metadata)
            """
        ),
    ] = None,
    description: Annotated[
        str | None,
        Doc(
            """
            Human-readable description.

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#declare-more-metadata)
            """
        ),
    ] = None,
    gt: Annotated[
        float | None,
        Doc(
            """
            Greater than. If set, value must be greater than this. Only applicable to
            numbers.

            Read more about it in the
            [FastAPI docs about Path parameters numeric validations](../tutorial/path-params-numeric-validations.md#number-validations-greater-than-and-less-than-or-equal)
            """
        ),
    ] = None,
    ge: Annotated[
        float | None,
        Doc(
            """
            Greater than or equal. If set, value must be greater than or equal to
            this. Only applicable to numbers.

            Read more about it in the
            [FastAPI docs about Path parameters numeric validations](../tutorial/path-params-numeric-validations.md#number-validations-greater-than-and-less-than-or-equal)
            """
        ),
    ] = None,
    lt: Annotated[
        float | None,
        Doc(
            """
            Less than. If set, value must be less than this. Only applicable to numbers.

            Read more about it in the
            [FastAPI docs about Path parameters numeric validations](../tutorial/path-params-numeric-validations.md#number-validations-greater-than-and-less-than-or-equal)
            """
        ),
    ] = None,
    le: Annotated[
        float | None,
        Doc(
            """
            Less than or equal. If set, value must be less than or equal to this.
            Only applicable to numbers.

            Read more about it in the
            [FastAPI docs about Path parameters numeric validations](../tutorial/path-params-numeric-validations.md#number-validations-greater-than-and-less-than-or-equal)
            """
        ),
    ] = None,
    min_length: Annotated[
        int | None,
        Doc(
            """
            Minimum length for strings.

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md)
            """
        ),
    ] = None,
    max_length: Annotated[
        int | None,
        Doc(
            """
            Maximum length for strings.

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md)
            """
        ),
    ] = None,
    pattern: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#add-regular-expressions
            """
        ),
    ] = None,
    regex: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
        deprecated(
            "Deprecated in FastAPI 0.100.0 and Pydantic v2, use `pattern` instead."
        ),
    ] = None,
    discriminator: Annotated[
        str | None,
        Doc(
            """
            Parameter field name for discriminating the type in a tagged union.
            """
        ),
    ] = None,
    strict: Annotated[
        bool | None,
        Doc(
            """
            If `True`, strict validation is applied to the field.
            """
        ),
    ] = _Unset,
    multiple_of: Annotated[
        float | None,
        Doc(
            """
            Value must be a multiple of this. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    allow_inf_nan: Annotated[
        bool | None,
        Doc(
            """
            Allow `inf`, `-inf`, `nan`. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    max_digits: Annotated[
        int | None,
        Doc(
            """
            Maximum number of digits allowed for decimal values.
            """
        ),
    ] = _Unset,
    decimal_places: Annotated[
        int | None,
        Doc(
            """
            Maximum number of decimal places allowed for decimal values.
            """
        ),
    ] = _Unset,
    examples: Annotated[
        list[Any] | None,
        Doc(
            """
            Example values for this field.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md)
            """
        ),
    ] = None,
    example: Annotated[
        Any | None,
        deprecated(
            "Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, "
            "although still supported. Use examples instead."
        ),
    ] = _Unset,
    openapi_examples: Annotated[
        dict[str, Example] | None,
        Doc(
            """
            OpenAPI-specific examples.

            It will be added to the generated OpenAPI (e.g. visible at `/docs`).

            Swagger UI (that provides the `/docs` interface) has better support for the
            OpenAPI-specific examples than the JSON Schema `examples`, that's the main
            use case for this.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md#using-the-openapi_examples-parameter).
            """
        ),
    ] = None,
    deprecated: Annotated[
        deprecated | str | bool | None,
        Doc(
            """
            Mark this parameter field as deprecated.

            It will affect the generated OpenAPI (e.g. visible at `/docs`).

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#deprecating-parameters)
            """
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            """
            To include (or not) this parameter field in the generated OpenAPI.
            You probably don't need it, but it's available.

            This affects the generated OpenAPI (e.g. visible at `/docs`).

            Read more about it in the
            [FastAPI docs about Query parameters](../tutorial/query-params-str-validations.md#exclude-parameters-from-openapi
            """
        ),
    ] = True,
    json_schema_extra: Annotated[
        dict[str, Any] | None,
        Doc(
            """
            Any additional JSON schema data.
            """
        ),
    ] = None,
    **extra: Annotated[
        Any,
        Doc(
            """
            Include extra fields used by the JSON Schema.
            """
        ),
        deprecated(
            """
            The `extra` kwargs is deprecated. Use `json_schema_extra` instead.
            """
        ),
    ],
) -> Any:
    return params.Query(
        default=default,
        default_factory=default_factory,
        alias=alias,
        alias_priority=alias_priority,
        validation_alias=validation_alias,
        serialization_alias=serialization_alias,
        title=title,
        description=description,
        gt=gt,
        ge=ge,
        lt=lt,
        le=le,
        min_length=min_length,
        max_length=max_length,
        pattern=pattern,
        regex=regex,
        discriminator=discriminator,
        strict=strict,
        multiple_of=multiple_of,
        allow_inf_nan=allow_inf_nan,
        max_digits=max_digits,
        decimal_places=decimal_places,
        example=example,
        examples=examples,
        openapi_examples=openapi_examples,
        deprecated=deprecated,
        include_in_schema=include_in_schema,
        json_schema_extra=json_schema_extra,
        **extra,
    )
Path(
    default=...,
    *,
    default_factory=_Unset,
    alias=None,
    alias_priority=_Unset,
    validation_alias=None,
    serialization_alias=None,
    title=None,
    description=None,
    gt=None,
    ge=None,
    lt=None,
    le=None,
    min_length=None,
    max_length=None,
    pattern=None,
    regex=None,
    discriminator=None,
    strict=_Unset,
    multiple_of=_Unset,
    allow_inf_nan=_Unset,
    max_digits=_Unset,
    decimal_places=_Unset,
    examples=None,
    example=_Unset,
    openapi_examples=None,
    deprecated=None,
    include_in_schema=True,
    json_schema_extra=None,
    **extra
)

Declare a path parameter for a path operation.

Read more about it in the FastAPI docs for Path Parameters and Numeric Validations.

from typing import Annotated

from fastapi import FastAPI, Path

app = FastAPI()

@app.get("/items/{item_id}")
async def read_items(
    item_id: Annotated[int, Path(title="The ID of the item to get")],
):
    return {"item_id": item_id}
PARAMETER DESCRIPTION
default Default value if the parameter field is not set. This doesn't affect Path parameters as the value is always required. The parameter is available only for compatibility. TYPE: Any DEFAULT: ...
default_factory A callable to generate the default value. This doesn't affect Path parameters as the value is always required. The parameter is available only for compatibility. TYPE: Callable[[], Any] | None DEFAULT: _Unset
alias An alternative name for the parameter field. This will be used to extract the data and for the generated OpenAPI. It is particularly useful when you can't use the name you want because it is a Python reserved keyword or similar. TYPE: str | None DEFAULT: None
alias_priority Priority of the alias. This affects whether an alias generator is used. TYPE: int | None DEFAULT: _Unset
validation_alias 'Whitelist' validation step. The parameter field will be the single one allowed by the alias or set of aliases defined. TYPE: str | AliasPath | AliasChoices | None DEFAULT: None
serialization_alias 'Blacklist' validation step. The vanilla parameter field will be the single one of the alias' or set of aliases' fields and all the other fields will be ignored at serialization time. TYPE: str | None DEFAULT: None
title Human-readable title. Read more about it in the FastAPI docs for Path Parameters and Numeric Validations TYPE: str | None DEFAULT: None
description Human-readable description. TYPE: str | None DEFAULT: None
gt Greater than. If set, value must be greater than this. Only applicable to numbers. Read more about it in the FastAPI docs about Path parameters numeric validations TYPE: float | None DEFAULT: None
ge Greater than or equal. If set, value must be greater than or equal to this. Only applicable to numbers. Read more about it in the FastAPI docs about Path parameters numeric validations TYPE: float | None DEFAULT: None
lt Less than. If set, value must be less than this. Only applicable to numbers. Read more about it in the FastAPI docs about Path parameters numeric validations TYPE: float | None DEFAULT: None
le Less than or equal. If set, value must be less than or equal to this. Only applicable to numbers. Read more about it in the FastAPI docs about Path parameters numeric validations TYPE: float | None DEFAULT: None
min_length Minimum length for strings. TYPE: int | None DEFAULT: None
max_length Maximum length for strings. TYPE: int | None DEFAULT: None
pattern RegEx pattern for strings. TYPE: str | None DEFAULT: None
regex Deprecated in FastAPI 0.100.0 and Pydantic v2, use pattern instead. RegEx pattern for strings. TYPE: str | None DEFAULT: None
discriminator Parameter field name for discriminating the type in a tagged union. TYPE: str | None DEFAULT: None
strict If True, strict validation is applied to the field. TYPE: bool | None DEFAULT: _Unset
multiple_of Value must be a multiple of this. Only applicable to numbers. TYPE: float | None DEFAULT: _Unset
allow_inf_nan Allow inf, -inf, nan. Only applicable to numbers. TYPE: bool | None DEFAULT: _Unset
max_digits Maximum number of digits allowed for decimal values. TYPE: int | None DEFAULT: _Unset
decimal_places Maximum number of decimal places allowed for decimal values. TYPE: int | None DEFAULT: _Unset
examples Example values for this field. Read more about it in the FastAPI docs for Declare Request Example Data TYPE: list[Any] | None DEFAULT: None
example Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, although still supported. Use examples instead. TYPE: Any | None DEFAULT: _Unset
openapi_examples OpenAPI-specific examples. It will be added to the generated OpenAPI (e.g. visible at /docs). Swagger UI (that provides the /docs interface) has better support for the OpenAPI-specific examples than the JSON Schema examples, that's the main use case for this. Read more about it in the FastAPI docs for Declare Request Example Data. TYPE: dict[str, Example] | None DEFAULT: None
deprecated Mark this parameter field as deprecated. It will affect the generated OpenAPI (e.g. visible at /docs). TYPE: deprecated | str | bool | None DEFAULT: None
include_in_schema To include (or not) this parameter field in the generated OpenAPI. You probably don't need it, but it's available. This affects the generated OpenAPI (e.g. visible at /docs). TYPE: bool DEFAULT: True
json_schema_extra Any additional JSON schema data. TYPE: dict[str, Any] | None DEFAULT: None
**extra The extra kwargs is deprecated. Use json_schema_extra instead. Include extra fields used by the JSON Schema. TYPE: Any DEFAULT: {}
Source code in fastapi/param_functions.py
def Path(  # noqa: N802
    default: Annotated[
        Any,
        Doc(
            """
            Default value if the parameter field is not set.

            This doesn't affect `Path` parameters as the value is always required.
            The parameter is available only for compatibility.
            """
        ),
    ] = ...,
    *,
    default_factory: Annotated[
        Callable[[], Any] | None,
        Doc(
            """
            A callable to generate the default value.

            This doesn't affect `Path` parameters as the value is always required.
            The parameter is available only for compatibility.
            """
        ),
    ] = _Unset,
    alias: Annotated[
        str | None,
        Doc(
            """
            An alternative name for the parameter field.

            This will be used to extract the data and for the generated OpenAPI.
            It is particularly useful when you can't use the name you want because it
            is a Python reserved keyword or similar.
            """
        ),
    ] = None,
    alias_priority: Annotated[
        int | None,
        Doc(
            """
            Priority of the alias. This affects whether an alias generator is used.
            """
        ),
    ] = _Unset,
    validation_alias: Annotated[
        str | AliasPath | AliasChoices | None,
        Doc(
            """
            'Whitelist' validation step. The parameter field will be the single one
            allowed by the alias or set of aliases defined.
            """
        ),
    ] = None,
    serialization_alias: Annotated[
        str | None,
        Doc(
            """
            'Blacklist' validation step. The vanilla parameter field will be the
            single one of the alias' or set of aliases' fields and all the other
            fields will be ignored at serialization time.
            """
        ),
    ] = None,
    title: Annotated[
        str | None,
        Doc(
            """
            Human-readable title.

            Read more about it in the
            [FastAPI docs for Path Parameters and Numeric Validations](../tutorial/path-params-numeric-validations.md#declare-metadata)
            """
        ),
    ] = None,
    description: Annotated[
        str | None,
        Doc(
            """
            Human-readable description.
            """
        ),
    ] = None,
    gt: Annotated[
        float | None,
        Doc(
            """
            Greater than. If set, value must be greater than this. Only applicable to
            numbers.

            Read more about it in the
            [FastAPI docs about Path parameters numeric validations](../tutorial/path-params-numeric-validations.md#number-validations-greater-than-and-less-than-or-equal)
            """
        ),
    ] = None,
    ge: Annotated[
        float | None,
        Doc(
            """
            Greater than or equal. If set, value must be greater than or equal to
            this. Only applicable to numbers.

            Read more about it in the
            [FastAPI docs about Path parameters numeric validations](../tutorial/path-params-numeric-validations.md#number-validations-greater-than-and-less-than-or-equal)
            """
        ),
    ] = None,
    lt: Annotated[
        float | None,
        Doc(
            """
            Less than. If set, value must be less than this. Only applicable to numbers.

            Read more about it in the
            [FastAPI docs about Path parameters numeric validations](../tutorial/path-params-numeric-validations.md#number-validations-greater-than-and-less-than-or-equal)
            """
        ),
    ] = None,
    le: Annotated[
        float | None,
        Doc(
            """
            Less than or equal. If set, value must be less than or equal to this.
            Only applicable to numbers.

            Read more about it in the
            [FastAPI docs about Path parameters numeric validations](../tutorial/path-params-numeric-validations.md#number-validations-greater-than-and-less-than-or-equal)
            """
        ),
    ] = None,
    min_length: Annotated[
        int | None,
        Doc(
            """
            Minimum length for strings.
            """
        ),
    ] = None,
    max_length: Annotated[
        int | None,
        Doc(
            """
            Maximum length for strings.
            """
        ),
    ] = None,
    pattern: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
    ] = None,
    regex: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
        deprecated(
            "Deprecated in FastAPI 0.100.0 and Pydantic v2, use `pattern` instead."
        ),
    ] = None,
    discriminator: Annotated[
        str | None,
        Doc(
            """
            Parameter field name for discriminating the type in a tagged union.
            """
        ),
    ] = None,
    strict: Annotated[
        bool | None,
        Doc(
            """
            If `True`, strict validation is applied to the field.
            """
        ),
    ] = _Unset,
    multiple_of: Annotated[
        float | None,
        Doc(
            """
            Value must be a multiple of this. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    allow_inf_nan: Annotated[
        bool | None,
        Doc(
            """
            Allow `inf`, `-inf`, `nan`. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    max_digits: Annotated[
        int | None,
        Doc(
            """
            Maximum number of digits allowed for decimal values.
            """
        ),
    ] = _Unset,
    decimal_places: Annotated[
        int | None,
        Doc(
            """
            Maximum number of decimal places allowed for decimal values.
            """
        ),
    ] = _Unset,
    examples: Annotated[
        list[Any] | None,
        Doc(
            """
            Example values for this field.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md)
            """
        ),
    ] = None,
    example: Annotated[
        Any | None,
        deprecated(
            "Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, "
            "although still supported. Use examples instead."
        ),
    ] = _Unset,
    openapi_examples: Annotated[
        dict[str, Example] | None,
        Doc(
            """
            OpenAPI-specific examples.

            It will be added to the generated OpenAPI (e.g. visible at `/docs`).

            Swagger UI (that provides the `/docs` interface) has better support for the
            OpenAPI-specific examples than the JSON Schema `examples`, that's the main
            use case for this.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md#using-the-openapi_examples-parameter).
            """
        ),
    ] = None,
    deprecated: Annotated[
        deprecated | str | bool | None,
        Doc(
            """
            Mark this parameter field as deprecated.

            It will affect the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            """
            To include (or not) this parameter field in the generated OpenAPI.
            You probably don't need it, but it's available.

            This affects the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = True,
    json_schema_extra: Annotated[
        dict[str, Any] | None,
        Doc(
            """
            Any additional JSON schema data.
            """
        ),
    ] = None,
    **extra: Annotated[
        Any,
        Doc(
            """
            Include extra fields used by the JSON Schema.
            """
        ),
        deprecated(
            """
            The `extra` kwargs is deprecated. Use `json_schema_extra` instead.
            """
        ),
    ],
) -> Any:
    """
    Declare a path parameter for a *path operation*.

    Read more about it in the
    [FastAPI docs for Path Parameters and Numeric Validations](../tutorial/path-params-numeric-validations.md).

    ```python
    from typing import Annotated

    from fastapi import FastAPI, Path

    app = FastAPI()

    @app.get("/items/{item_id}")
    async def read_items(
        item_id: Annotated[int, Path(title="The ID of the item to get")],
    ):
        return {"item_id": item_id}
    ```
    """
    return params.Path(
        default=default,
        default_factory=default_factory,
        alias=alias,
        alias_priority=alias_priority,
        validation_alias=validation_alias,
        serialization_alias=serialization_alias,
        title=title,
        description=description,
        gt=gt,
        ge=ge,
        lt=lt,
        le=le,
        min_length=min_length,
        max_length=max_length,
        pattern=pattern,
        regex=regex,
        discriminator=discriminator,
        strict=strict,
        multiple_of=multiple_of,
        allow_inf_nan=allow_inf_nan,
        max_digits=max_digits,
        decimal_places=decimal_places,
        example=example,
        examples=examples,
        openapi_examples=openapi_examples,
        deprecated=deprecated,
        include_in_schema=include_in_schema,
        json_schema_extra=json_schema_extra,
        **extra,
    )
Body(
    default=Undefined,
    *,
    default_factory=_Unset,
    embed=None,
    media_type="application/json",
    alias=None,
    alias_priority=_Unset,
    validation_alias=None,
    serialization_alias=None,
    title=None,
    description=None,
    gt=None,
    ge=None,
    lt=None,
    le=None,
    min_length=None,
    max_length=None,
    pattern=None,
    regex=None,
    discriminator=None,
    strict=_Unset,
    multiple_of=_Unset,
    allow_inf_nan=_Unset,
    max_digits=_Unset,
    decimal_places=_Unset,
    examples=None,
    example=_Unset,
    openapi_examples=None,
    deprecated=None,
    include_in_schema=True,
    json_schema_extra=None,
    **extra
)
PARAMETER DESCRIPTION
default Default value if the parameter field is not set. TYPE: Any DEFAULT: Undefined
default_factory A callable to generate the default value. This doesn't affect Path parameters as the value is always required. The parameter is available only for compatibility. TYPE: Callable[[], Any] | None DEFAULT: _Unset
embed When embed is True, the parameter will be expected in a JSON body as a key instead of being the JSON body itself. This happens automatically when more than one Body parameter is declared. Read more about it in the FastAPI docs for Body - Multiple Parameters. TYPE: bool | None DEFAULT: None
media_type The media type of this parameter field. Changing it would affect the generated OpenAPI, but currently it doesn't affect the parsing of the data. TYPE: str DEFAULT: 'application/json'
alias An alternative name for the parameter field. This will be used to extract the data and for the generated OpenAPI. It is particularly useful when you can't use the name you want because it is a Python reserved keyword or similar. TYPE: str | None DEFAULT: None
alias_priority Priority of the alias. This affects whether an alias generator is used. TYPE: int | None DEFAULT: _Unset
validation_alias 'Whitelist' validation step. The parameter field will be the single one allowed by the alias or set of aliases defined. TYPE: str | AliasPath | AliasChoices | None DEFAULT: None
serialization_alias 'Blacklist' validation step. The vanilla parameter field will be the single one of the alias' or set of aliases' fields and all the other fields will be ignored at serialization time. TYPE: str | None DEFAULT: None
title Human-readable title. TYPE: str | None DEFAULT: None
description Human-readable description. TYPE: str | None DEFAULT: None
gt Greater than. If set, value must be greater than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
ge Greater than or equal. If set, value must be greater than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
lt Less than. If set, value must be less than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
le Less than or equal. If set, value must be less than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
min_length Minimum length for strings. TYPE: int | None DEFAULT: None
max_length Maximum length for strings. TYPE: int | None DEFAULT: None
pattern RegEx pattern for strings. TYPE: str | None DEFAULT: None
regex Deprecated in FastAPI 0.100.0 and Pydantic v2, use pattern instead. RegEx pattern for strings. TYPE: str | None DEFAULT: None
discriminator Parameter field name for discriminating the type in a tagged union. TYPE: str | None DEFAULT: None
strict If True, strict validation is applied to the field. TYPE: bool | None DEFAULT: _Unset
multiple_of Value must be a multiple of this. Only applicable to numbers. TYPE: float | None DEFAULT: _Unset
allow_inf_nan Allow inf, -inf, nan. Only applicable to numbers. TYPE: bool | None DEFAULT: _Unset
max_digits Maximum number of digits allowed for decimal values. TYPE: int | None DEFAULT: _Unset
decimal_places Maximum number of decimal places allowed for decimal values. TYPE: int | None DEFAULT: _Unset
examples Example values for this field. Read more about it in the FastAPI docs for Declare Request Example Data TYPE: list[Any] | None DEFAULT: None
example Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, although still supported. Use examples instead. TYPE: Any | None DEFAULT: _Unset
openapi_examples OpenAPI-specific examples. It will be added to the generated OpenAPI (e.g. visible at /docs). Swagger UI (that provides the /docs interface) has better support for the OpenAPI-specific examples than the JSON Schema examples, that's the main use case for this. Read more about it in the FastAPI docs for Declare Request Example Data. TYPE: dict[str, Example] | None DEFAULT: None
deprecated Mark this parameter field as deprecated. It will affect the generated OpenAPI (e.g. visible at /docs). TYPE: deprecated | str | bool | None DEFAULT: None
include_in_schema To include (or not) this parameter field in the generated OpenAPI. You probably don't need it, but it's available. This affects the generated OpenAPI (e.g. visible at /docs). TYPE: bool DEFAULT: True
json_schema_extra Any additional JSON schema data. TYPE: dict[str, Any] | None DEFAULT: None
**extra The extra kwargs is deprecated. Use json_schema_extra instead. Include extra fields used by the JSON Schema. TYPE: Any DEFAULT: {}
Source code in fastapi/param_functions.py
def Body(  # noqa: N802
    default: Annotated[
        Any,
        Doc(
            """
            Default value if the parameter field is not set.
            """
        ),
    ] = Undefined,
    *,
    default_factory: Annotated[
        Callable[[], Any] | None,
        Doc(
            """
            A callable to generate the default value.

            This doesn't affect `Path` parameters as the value is always required.
            The parameter is available only for compatibility.
            """
        ),
    ] = _Unset,
    embed: Annotated[
        bool | None,
        Doc(
            """
            When `embed` is `True`, the parameter will be expected in a JSON body as a
            key instead of being the JSON body itself.

            This happens automatically when more than one `Body` parameter is declared.

            Read more about it in the
            [FastAPI docs for Body - Multiple Parameters](../tutorial/body-multiple-params.md#embed-a-single-body-parameter).
            """
        ),
    ] = None,
    media_type: Annotated[
        str,
        Doc(
            """
            The media type of this parameter field. Changing it would affect the
            generated OpenAPI, but currently it doesn't affect the parsing of the data.
            """
        ),
    ] = "application/json",
    alias: Annotated[
        str | None,
        Doc(
            """
            An alternative name for the parameter field.

            This will be used to extract the data and for the generated OpenAPI.
            It is particularly useful when you can't use the name you want because it
            is a Python reserved keyword or similar.
            """
        ),
    ] = None,
    alias_priority: Annotated[
        int | None,
        Doc(
            """
            Priority of the alias. This affects whether an alias generator is used.
            """
        ),
    ] = _Unset,
    validation_alias: Annotated[
        str | AliasPath | AliasChoices | None,
        Doc(
            """
            'Whitelist' validation step. The parameter field will be the single one
            allowed by the alias or set of aliases defined.
            """
        ),
    ] = None,
    serialization_alias: Annotated[
        str | None,
        Doc(
            """
            'Blacklist' validation step. The vanilla parameter field will be the
            single one of the alias' or set of aliases' fields and all the other
            fields will be ignored at serialization time.
            """
        ),
    ] = None,
    title: Annotated[
        str | None,
        Doc(
            """
            Human-readable title.
            """
        ),
    ] = None,
    description: Annotated[
        str | None,
        Doc(
            """
            Human-readable description.
            """
        ),
    ] = None,
    gt: Annotated[
        float | None,
        Doc(
            """
            Greater than. If set, value must be greater than this. Only applicable to
            numbers.
            """
        ),
    ] = None,
    ge: Annotated[
        float | None,
        Doc(
            """
            Greater than or equal. If set, value must be greater than or equal to
            this. Only applicable to numbers.
            """
        ),
    ] = None,
    lt: Annotated[
        float | None,
        Doc(
            """
            Less than. If set, value must be less than this. Only applicable to numbers.
            """
        ),
    ] = None,
    le: Annotated[
        float | None,
        Doc(
            """
            Less than or equal. If set, value must be less than or equal to this.
            Only applicable to numbers.
            """
        ),
    ] = None,
    min_length: Annotated[
        int | None,
        Doc(
            """
            Minimum length for strings.
            """
        ),
    ] = None,
    max_length: Annotated[
        int | None,
        Doc(
            """
            Maximum length for strings.
            """
        ),
    ] = None,
    pattern: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
    ] = None,
    regex: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
        deprecated(
            "Deprecated in FastAPI 0.100.0 and Pydantic v2, use `pattern` instead."
        ),
    ] = None,
    discriminator: Annotated[
        str | None,
        Doc(
            """
            Parameter field name for discriminating the type in a tagged union.
            """
        ),
    ] = None,
    strict: Annotated[
        bool | None,
        Doc(
            """
            If `True`, strict validation is applied to the field.
            """
        ),
    ] = _Unset,
    multiple_of: Annotated[
        float | None,
        Doc(
            """
            Value must be a multiple of this. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    allow_inf_nan: Annotated[
        bool | None,
        Doc(
            """
            Allow `inf`, `-inf`, `nan`. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    max_digits: Annotated[
        int | None,
        Doc(
            """
            Maximum number of digits allowed for decimal values.
            """
        ),
    ] = _Unset,
    decimal_places: Annotated[
        int | None,
        Doc(
            """
            Maximum number of decimal places allowed for decimal values.
            """
        ),
    ] = _Unset,
    examples: Annotated[
        list[Any] | None,
        Doc(
            """
            Example values for this field.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md)
            """
        ),
    ] = None,
    example: Annotated[
        Any | None,
        deprecated(
            "Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, "
            "although still supported. Use examples instead."
        ),
    ] = _Unset,
    openapi_examples: Annotated[
        dict[str, Example] | None,
        Doc(
            """
            OpenAPI-specific examples.

            It will be added to the generated OpenAPI (e.g. visible at `/docs`).

            Swagger UI (that provides the `/docs` interface) has better support for the
            OpenAPI-specific examples than the JSON Schema `examples`, that's the main
            use case for this.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md#using-the-openapi_examples-parameter).
            """
        ),
    ] = None,
    deprecated: Annotated[
        deprecated | str | bool | None,
        Doc(
            """
            Mark this parameter field as deprecated.

            It will affect the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            """
            To include (or not) this parameter field in the generated OpenAPI.
            You probably don't need it, but it's available.

            This affects the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = True,
    json_schema_extra: Annotated[
        dict[str, Any] | None,
        Doc(
            """
            Any additional JSON schema data.
            """
        ),
    ] = None,
    **extra: Annotated[
        Any,
        Doc(
            """
            Include extra fields used by the JSON Schema.
            """
        ),
        deprecated(
            """
            The `extra` kwargs is deprecated. Use `json_schema_extra` instead.
            """
        ),
    ],
) -> Any:
    return params.Body(
        default=default,
        default_factory=default_factory,
        embed=embed,
        media_type=media_type,
        alias=alias,
        alias_priority=alias_priority,
        validation_alias=validation_alias,
        serialization_alias=serialization_alias,
        title=title,
        description=description,
        gt=gt,
        ge=ge,
        lt=lt,
        le=le,
        min_length=min_length,
        max_length=max_length,
        pattern=pattern,
        regex=regex,
        discriminator=discriminator,
        strict=strict,
        multiple_of=multiple_of,
        allow_inf_nan=allow_inf_nan,
        max_digits=max_digits,
        decimal_places=decimal_places,
        example=example,
        examples=examples,
        openapi_examples=openapi_examples,
        deprecated=deprecated,
        include_in_schema=include_in_schema,
        json_schema_extra=json_schema_extra,
        **extra,
    )
Cookie(
    default=Undefined,
    *,
    default_factory=_Unset,
    alias=None,
    alias_priority=_Unset,
    validation_alias=None,
    serialization_alias=None,
    title=None,
    description=None,
    gt=None,
    ge=None,
    lt=None,
    le=None,
    min_length=None,
    max_length=None,
    pattern=None,
    regex=None,
    discriminator=None,
    strict=_Unset,
    multiple_of=_Unset,
    allow_inf_nan=_Unset,
    max_digits=_Unset,
    decimal_places=_Unset,
    examples=None,
    example=_Unset,
    openapi_examples=None,
    deprecated=None,
    include_in_schema=True,
    json_schema_extra=None,
    **extra
)
PARAMETER DESCRIPTION
default Default value if the parameter field is not set. TYPE: Any DEFAULT: Undefined
default_factory A callable to generate the default value. This doesn't affect Path parameters as the value is always required. The parameter is available only for compatibility. TYPE: Callable[[], Any] | None DEFAULT: _Unset
alias An alternative name for the parameter field. This will be used to extract the data and for the generated OpenAPI. It is particularly useful when you can't use the name you want because it is a Python reserved keyword or similar. TYPE: str | None DEFAULT: None
alias_priority Priority of the alias. This affects whether an alias generator is used. TYPE: int | None DEFAULT: _Unset
validation_alias 'Whitelist' validation step. The parameter field will be the single one allowed by the alias or set of aliases defined. TYPE: str | AliasPath | AliasChoices | None DEFAULT: None
serialization_alias 'Blacklist' validation step. The vanilla parameter field will be the single one of the alias' or set of aliases' fields and all the other fields will be ignored at serialization time. TYPE: str | None DEFAULT: None
title Human-readable title. TYPE: str | None DEFAULT: None
description Human-readable description. TYPE: str | None DEFAULT: None
gt Greater than. If set, value must be greater than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
ge Greater than or equal. If set, value must be greater than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
lt Less than. If set, value must be less than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
le Less than or equal. If set, value must be less than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
min_length Minimum length for strings. TYPE: int | None DEFAULT: None
max_length Maximum length for strings. TYPE: int | None DEFAULT: None
pattern RegEx pattern for strings. TYPE: str | None DEFAULT: None
regex Deprecated in FastAPI 0.100.0 and Pydantic v2, use pattern instead. RegEx pattern for strings. TYPE: str | None DEFAULT: None
discriminator Parameter field name for discriminating the type in a tagged union. TYPE: str | None DEFAULT: None
strict If True, strict validation is applied to the field. TYPE: bool | None DEFAULT: _Unset
multiple_of Value must be a multiple of this. Only applicable to numbers. TYPE: float | None DEFAULT: _Unset
allow_inf_nan Allow inf, -inf, nan. Only applicable to numbers. TYPE: bool | None DEFAULT: _Unset
max_digits Maximum number of digits allowed for decimal values. TYPE: int | None DEFAULT: _Unset
decimal_places Maximum number of decimal places allowed for decimal values. TYPE: int | None DEFAULT: _Unset
examples Example values for this field. Read more about it in the FastAPI docs for Declare Request Example Data TYPE: list[Any] | None DEFAULT: None
example Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, although still supported. Use examples instead. TYPE: Any | None DEFAULT: _Unset
openapi_examples OpenAPI-specific examples. It will be added to the generated OpenAPI (e.g. visible at /docs). Swagger UI (that provides the /docs interface) has better support for the OpenAPI-specific examples than the JSON Schema examples, that's the main use case for this. Read more about it in the FastAPI docs for Declare Request Example Data. TYPE: dict[str, Example] | None DEFAULT: None
deprecated Mark this parameter field as deprecated. It will affect the generated OpenAPI (e.g. visible at /docs). TYPE: deprecated | str | bool | None DEFAULT: None
include_in_schema To include (or not) this parameter field in the generated OpenAPI. You probably don't need it, but it's available. This affects the generated OpenAPI (e.g. visible at /docs). TYPE: bool DEFAULT: True
json_schema_extra Any additional JSON schema data. TYPE: dict[str, Any] | None DEFAULT: None
**extra The extra kwargs is deprecated. Use json_schema_extra instead. Include extra fields used by the JSON Schema. TYPE: Any DEFAULT: {}
Source code in fastapi/param_functions.py
def Cookie(  # noqa: N802
    default: Annotated[
        Any,
        Doc(
            """
            Default value if the parameter field is not set.
            """
        ),
    ] = Undefined,
    *,
    default_factory: Annotated[
        Callable[[], Any] | None,
        Doc(
            """
            A callable to generate the default value.

            This doesn't affect `Path` parameters as the value is always required.
            The parameter is available only for compatibility.
            """
        ),
    ] = _Unset,
    alias: Annotated[
        str | None,
        Doc(
            """
            An alternative name for the parameter field.

            This will be used to extract the data and for the generated OpenAPI.
            It is particularly useful when you can't use the name you want because it
            is a Python reserved keyword or similar.
            """
        ),
    ] = None,
    alias_priority: Annotated[
        int | None,
        Doc(
            """
            Priority of the alias. This affects whether an alias generator is used.
            """
        ),
    ] = _Unset,
    validation_alias: Annotated[
        str | AliasPath | AliasChoices | None,
        Doc(
            """
            'Whitelist' validation step. The parameter field will be the single one
            allowed by the alias or set of aliases defined.
            """
        ),
    ] = None,
    serialization_alias: Annotated[
        str | None,
        Doc(
            """
            'Blacklist' validation step. The vanilla parameter field will be the
            single one of the alias' or set of aliases' fields and all the other
            fields will be ignored at serialization time.
            """
        ),
    ] = None,
    title: Annotated[
        str | None,
        Doc(
            """
            Human-readable title.
            """
        ),
    ] = None,
    description: Annotated[
        str | None,
        Doc(
            """
            Human-readable description.
            """
        ),
    ] = None,
    gt: Annotated[
        float | None,
        Doc(
            """
            Greater than. If set, value must be greater than this. Only applicable to
            numbers.
            """
        ),
    ] = None,
    ge: Annotated[
        float | None,
        Doc(
            """
            Greater than or equal. If set, value must be greater than or equal to
            this. Only applicable to numbers.
            """
        ),
    ] = None,
    lt: Annotated[
        float | None,
        Doc(
            """
            Less than. If set, value must be less than this. Only applicable to numbers.
            """
        ),
    ] = None,
    le: Annotated[
        float | None,
        Doc(
            """
            Less than or equal. If set, value must be less than or equal to this.
            Only applicable to numbers.
            """
        ),
    ] = None,
    min_length: Annotated[
        int | None,
        Doc(
            """
            Minimum length for strings.
            """
        ),
    ] = None,
    max_length: Annotated[
        int | None,
        Doc(
            """
            Maximum length for strings.
            """
        ),
    ] = None,
    pattern: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
    ] = None,
    regex: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
        deprecated(
            "Deprecated in FastAPI 0.100.0 and Pydantic v2, use `pattern` instead."
        ),
    ] = None,
    discriminator: Annotated[
        str | None,
        Doc(
            """
            Parameter field name for discriminating the type in a tagged union.
            """
        ),
    ] = None,
    strict: Annotated[
        bool | None,
        Doc(
            """
            If `True`, strict validation is applied to the field.
            """
        ),
    ] = _Unset,
    multiple_of: Annotated[
        float | None,
        Doc(
            """
            Value must be a multiple of this. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    allow_inf_nan: Annotated[
        bool | None,
        Doc(
            """
            Allow `inf`, `-inf`, `nan`. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    max_digits: Annotated[
        int | None,
        Doc(
            """
            Maximum number of digits allowed for decimal values.
            """
        ),
    ] = _Unset,
    decimal_places: Annotated[
        int | None,
        Doc(
            """
            Maximum number of decimal places allowed for decimal values.
            """
        ),
    ] = _Unset,
    examples: Annotated[
        list[Any] | None,
        Doc(
            """
            Example values for this field.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md)
            """
        ),
    ] = None,
    example: Annotated[
        Any | None,
        deprecated(
            "Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, "
            "although still supported. Use examples instead."
        ),
    ] = _Unset,
    openapi_examples: Annotated[
        dict[str, Example] | None,
        Doc(
            """
            OpenAPI-specific examples.

            It will be added to the generated OpenAPI (e.g. visible at `/docs`).

            Swagger UI (that provides the `/docs` interface) has better support for the
            OpenAPI-specific examples than the JSON Schema `examples`, that's the main
            use case for this.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md#using-the-openapi_examples-parameter).
            """
        ),
    ] = None,
    deprecated: Annotated[
        deprecated | str | bool | None,
        Doc(
            """
            Mark this parameter field as deprecated.

            It will affect the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            """
            To include (or not) this parameter field in the generated OpenAPI.
            You probably don't need it, but it's available.

            This affects the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = True,
    json_schema_extra: Annotated[
        dict[str, Any] | None,
        Doc(
            """
            Any additional JSON schema data.
            """
        ),
    ] = None,
    **extra: Annotated[
        Any,
        Doc(
            """
            Include extra fields used by the JSON Schema.
            """
        ),
        deprecated(
            """
            The `extra` kwargs is deprecated. Use `json_schema_extra` instead.
            """
        ),
    ],
) -> Any:
    return params.Cookie(
        default=default,
        default_factory=default_factory,
        alias=alias,
        alias_priority=alias_priority,
        validation_alias=validation_alias,
        serialization_alias=serialization_alias,
        title=title,
        description=description,
        gt=gt,
        ge=ge,
        lt=lt,
        le=le,
        min_length=min_length,
        max_length=max_length,
        pattern=pattern,
        regex=regex,
        discriminator=discriminator,
        strict=strict,
        multiple_of=multiple_of,
        allow_inf_nan=allow_inf_nan,
        max_digits=max_digits,
        decimal_places=decimal_places,
        example=example,
        examples=examples,
        openapi_examples=openapi_examples,
        deprecated=deprecated,
        include_in_schema=include_in_schema,
        json_schema_extra=json_schema_extra,
        **extra,
    )
Header(
    default=Undefined,
    *,
    default_factory=_Unset,
    alias=None,
    alias_priority=_Unset,
    validation_alias=None,
    serialization_alias=None,
    convert_underscores=True,
    title=None,
    description=None,
    gt=None,
    ge=None,
    lt=None,
    le=None,
    min_length=None,
    max_length=None,
    pattern=None,
    regex=None,
    discriminator=None,
    strict=_Unset,
    multiple_of=_Unset,
    allow_inf_nan=_Unset,
    max_digits=_Unset,
    decimal_places=_Unset,
    examples=None,
    example=_Unset,
    openapi_examples=None,
    deprecated=None,
    include_in_schema=True,
    json_schema_extra=None,
    **extra
)
PARAMETER DESCRIPTION
default Default value if the parameter field is not set. TYPE: Any DEFAULT: Undefined
default_factory A callable to generate the default value. This doesn't affect Path parameters as the value is always required. The parameter is available only for compatibility. TYPE: Callable[[], Any] | None DEFAULT: _Unset
alias An alternative name for the parameter field. This will be used to extract the data and for the generated OpenAPI. It is particularly useful when you can't use the name you want because it is a Python reserved keyword or similar. TYPE: str | None DEFAULT: None
alias_priority Priority of the alias. This affects whether an alias generator is used. TYPE: int | None DEFAULT: _Unset
validation_alias 'Whitelist' validation step. The parameter field will be the single one allowed by the alias or set of aliases defined. TYPE: str | AliasPath | AliasChoices | None DEFAULT: None
serialization_alias 'Blacklist' validation step. The vanilla parameter field will be the single one of the alias' or set of aliases' fields and all the other fields will be ignored at serialization time. TYPE: str | None DEFAULT: None
convert_underscores Automatically convert underscores to hyphens in the parameter field name. Read more about it in the FastAPI docs for Header Parameters TYPE: bool DEFAULT: True
title Human-readable title. TYPE: str | None DEFAULT: None
description Human-readable description. TYPE: str | None DEFAULT: None
gt Greater than. If set, value must be greater than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
ge Greater than or equal. If set, value must be greater than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
lt Less than. If set, value must be less than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
le Less than or equal. If set, value must be less than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
min_length Minimum length for strings. TYPE: int | None DEFAULT: None
max_length Maximum length for strings. TYPE: int | None DEFAULT: None
pattern RegEx pattern for strings. TYPE: str | None DEFAULT: None
regex Deprecated in FastAPI 0.100.0 and Pydantic v2, use pattern instead. RegEx pattern for strings. TYPE: str | None DEFAULT: None
discriminator Parameter field name for discriminating the type in a tagged union. TYPE: str | None DEFAULT: None
strict If True, strict validation is applied to the field. TYPE: bool | None DEFAULT: _Unset
multiple_of Value must be a multiple of this. Only applicable to numbers. TYPE: float | None DEFAULT: _Unset
allow_inf_nan Allow inf, -inf, nan. Only applicable to numbers. TYPE: bool | None DEFAULT: _Unset
max_digits Maximum number of digits allowed for decimal values. TYPE: int | None DEFAULT: _Unset
decimal_places Maximum number of decimal places allowed for decimal values. TYPE: int | None DEFAULT: _Unset
examples Example values for this field. Read more about it in the FastAPI docs for Declare Request Example Data TYPE: list[Any] | None DEFAULT: None
example Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, although still supported. Use examples instead. TYPE: Any | None DEFAULT: _Unset
openapi_examples OpenAPI-specific examples. It will be added to the generated OpenAPI (e.g. visible at /docs). Swagger UI (that provides the /docs interface) has better support for the OpenAPI-specific examples than the JSON Schema examples, that's the main use case for this. Read more about it in the FastAPI docs for Declare Request Example Data. TYPE: dict[str, Example] | None DEFAULT: None
deprecated Mark this parameter field as deprecated. It will affect the generated OpenAPI (e.g. visible at /docs). TYPE: deprecated | str | bool | None DEFAULT: None
include_in_schema To include (or not) this parameter field in the generated OpenAPI. You probably don't need it, but it's available. This affects the generated OpenAPI (e.g. visible at /docs). TYPE: bool DEFAULT: True
json_schema_extra Any additional JSON schema data. TYPE: dict[str, Any] | None DEFAULT: None
**extra The extra kwargs is deprecated. Use json_schema_extra instead. Include extra fields used by the JSON Schema. TYPE: Any DEFAULT: {}
Source code in fastapi/param_functions.py
def Header(  # noqa: N802
    default: Annotated[
        Any,
        Doc(
            """
            Default value if the parameter field is not set.
            """
        ),
    ] = Undefined,
    *,
    default_factory: Annotated[
        Callable[[], Any] | None,
        Doc(
            """
            A callable to generate the default value.

            This doesn't affect `Path` parameters as the value is always required.
            The parameter is available only for compatibility.
            """
        ),
    ] = _Unset,
    alias: Annotated[
        str | None,
        Doc(
            """
            An alternative name for the parameter field.

            This will be used to extract the data and for the generated OpenAPI.
            It is particularly useful when you can't use the name you want because it
            is a Python reserved keyword or similar.
            """
        ),
    ] = None,
    alias_priority: Annotated[
        int | None,
        Doc(
            """
            Priority of the alias. This affects whether an alias generator is used.
            """
        ),
    ] = _Unset,
    validation_alias: Annotated[
        str | AliasPath | AliasChoices | None,
        Doc(
            """
            'Whitelist' validation step. The parameter field will be the single one
            allowed by the alias or set of aliases defined.
            """
        ),
    ] = None,
    serialization_alias: Annotated[
        str | None,
        Doc(
            """
            'Blacklist' validation step. The vanilla parameter field will be the
            single one of the alias' or set of aliases' fields and all the other
            fields will be ignored at serialization time.
            """
        ),
    ] = None,
    convert_underscores: Annotated[
        bool,
        Doc(
            """
            Automatically convert underscores to hyphens in the parameter field name.

            Read more about it in the
            [FastAPI docs for Header Parameters](../tutorial/header-params.md#automatic-conversion)
            """
        ),
    ] = True,
    title: Annotated[
        str | None,
        Doc(
            """
            Human-readable title.
            """
        ),
    ] = None,
    description: Annotated[
        str | None,
        Doc(
            """
            Human-readable description.
            """
        ),
    ] = None,
    gt: Annotated[
        float | None,
        Doc(
            """
            Greater than. If set, value must be greater than this. Only applicable to
            numbers.
            """
        ),
    ] = None,
    ge: Annotated[
        float | None,
        Doc(
            """
            Greater than or equal. If set, value must be greater than or equal to
            this. Only applicable to numbers.
            """
        ),
    ] = None,
    lt: Annotated[
        float | None,
        Doc(
            """
            Less than. If set, value must be less than this. Only applicable to numbers.
            """
        ),
    ] = None,
    le: Annotated[
        float | None,
        Doc(
            """
            Less than or equal. If set, value must be less than or equal to this.
            Only applicable to numbers.
            """
        ),
    ] = None,
    min_length: Annotated[
        int | None,
        Doc(
            """
            Minimum length for strings.
            """
        ),
    ] = None,
    max_length: Annotated[
        int | None,
        Doc(
            """
            Maximum length for strings.
            """
        ),
    ] = None,
    pattern: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
    ] = None,
    regex: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
        deprecated(
            "Deprecated in FastAPI 0.100.0 and Pydantic v2, use `pattern` instead."
        ),
    ] = None,
    discriminator: Annotated[
        str | None,
        Doc(
            """
            Parameter field name for discriminating the type in a tagged union.
            """
        ),
    ] = None,
    strict: Annotated[
        bool | None,
        Doc(
            """
            If `True`, strict validation is applied to the field.
            """
        ),
    ] = _Unset,
    multiple_of: Annotated[
        float | None,
        Doc(
            """
            Value must be a multiple of this. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    allow_inf_nan: Annotated[
        bool | None,
        Doc(
            """
            Allow `inf`, `-inf`, `nan`. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    max_digits: Annotated[
        int | None,
        Doc(
            """
            Maximum number of digits allowed for decimal values.
            """
        ),
    ] = _Unset,
    decimal_places: Annotated[
        int | None,
        Doc(
            """
            Maximum number of decimal places allowed for decimal values.
            """
        ),
    ] = _Unset,
    examples: Annotated[
        list[Any] | None,
        Doc(
            """
            Example values for this field.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md)
            """
        ),
    ] = None,
    example: Annotated[
        Any | None,
        deprecated(
            "Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, "
            "although still supported. Use examples instead."
        ),
    ] = _Unset,
    openapi_examples: Annotated[
        dict[str, Example] | None,
        Doc(
            """
            OpenAPI-specific examples.

            It will be added to the generated OpenAPI (e.g. visible at `/docs`).

            Swagger UI (that provides the `/docs` interface) has better support for the
            OpenAPI-specific examples than the JSON Schema `examples`, that's the main
            use case for this.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md#using-the-openapi_examples-parameter).
            """
        ),
    ] = None,
    deprecated: Annotated[
        deprecated | str | bool | None,
        Doc(
            """
            Mark this parameter field as deprecated.

            It will affect the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            """
            To include (or not) this parameter field in the generated OpenAPI.
            You probably don't need it, but it's available.

            This affects the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = True,
    json_schema_extra: Annotated[
        dict[str, Any] | None,
        Doc(
            """
            Any additional JSON schema data.
            """
        ),
    ] = None,
    **extra: Annotated[
        Any,
        Doc(
            """
            Include extra fields used by the JSON Schema.
            """
        ),
        deprecated(
            """
            The `extra` kwargs is deprecated. Use `json_schema_extra` instead.
            """
        ),
    ],
) -> Any:
    return params.Header(
        default=default,
        default_factory=default_factory,
        alias=alias,
        alias_priority=alias_priority,
        validation_alias=validation_alias,
        serialization_alias=serialization_alias,
        convert_underscores=convert_underscores,
        title=title,
        description=description,
        gt=gt,
        ge=ge,
        lt=lt,
        le=le,
        min_length=min_length,
        max_length=max_length,
        pattern=pattern,
        regex=regex,
        discriminator=discriminator,
        strict=strict,
        multiple_of=multiple_of,
        allow_inf_nan=allow_inf_nan,
        max_digits=max_digits,
        decimal_places=decimal_places,
        example=example,
        examples=examples,
        openapi_examples=openapi_examples,
        deprecated=deprecated,
        include_in_schema=include_in_schema,
        json_schema_extra=json_schema_extra,
        **extra,
    )
Form(
    default=Undefined,
    *,
    default_factory=_Unset,
    media_type="application/x-www-form-urlencoded",
    alias=None,
    alias_priority=_Unset,
    validation_alias=None,
    serialization_alias=None,
    title=None,
    description=None,
    gt=None,
    ge=None,
    lt=None,
    le=None,
    min_length=None,
    max_length=None,
    pattern=None,
    regex=None,
    discriminator=None,
    strict=_Unset,
    multiple_of=_Unset,
    allow_inf_nan=_Unset,
    max_digits=_Unset,
    decimal_places=_Unset,
    examples=None,
    example=_Unset,
    openapi_examples=None,
    deprecated=None,
    include_in_schema=True,
    json_schema_extra=None,
    **extra
)
PARAMETER DESCRIPTION
default Default value if the parameter field is not set. TYPE: Any DEFAULT: Undefined
default_factory A callable to generate the default value. This doesn't affect Path parameters as the value is always required. The parameter is available only for compatibility. TYPE: Callable[[], Any] | None DEFAULT: _Unset
media_type The media type of this parameter field. Changing it would affect the generated OpenAPI, but currently it doesn't affect the parsing of the data. TYPE: str DEFAULT: 'application/x-www-form-urlencoded'
alias An alternative name for the parameter field. This will be used to extract the data and for the generated OpenAPI. It is particularly useful when you can't use the name you want because it is a Python reserved keyword or similar. TYPE: str | None DEFAULT: None
alias_priority Priority of the alias. This affects whether an alias generator is used. TYPE: int | None DEFAULT: _Unset
validation_alias 'Whitelist' validation step. The parameter field will be the single one allowed by the alias or set of aliases defined. TYPE: str | AliasPath | AliasChoices | None DEFAULT: None
serialization_alias 'Blacklist' validation step. The vanilla parameter field will be the single one of the alias' or set of aliases' fields and all the other fields will be ignored at serialization time. TYPE: str | None DEFAULT: None
title Human-readable title. TYPE: str | None DEFAULT: None
description Human-readable description. TYPE: str | None DEFAULT: None
gt Greater than. If set, value must be greater than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
ge Greater than or equal. If set, value must be greater than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
lt Less than. If set, value must be less than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
le Less than or equal. If set, value must be less than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
min_length Minimum length for strings. TYPE: int | None DEFAULT: None
max_length Maximum length for strings. TYPE: int | None DEFAULT: None
pattern RegEx pattern for strings. TYPE: str | None DEFAULT: None
regex Deprecated in FastAPI 0.100.0 and Pydantic v2, use pattern instead. RegEx pattern for strings. TYPE: str | None DEFAULT: None
discriminator Parameter field name for discriminating the type in a tagged union. TYPE: str | None DEFAULT: None
strict If True, strict validation is applied to the field. TYPE: bool | None DEFAULT: _Unset
multiple_of Value must be a multiple of this. Only applicable to numbers. TYPE: float | None DEFAULT: _Unset
allow_inf_nan Allow inf, -inf, nan. Only applicable to numbers. TYPE: bool | None DEFAULT: _Unset
max_digits Maximum number of digits allowed for decimal values. TYPE: int | None DEFAULT: _Unset
decimal_places Maximum number of decimal places allowed for decimal values. TYPE: int | None DEFAULT: _Unset
examples Example values for this field. Read more about it in the FastAPI docs for Declare Request Example Data TYPE: list[Any] | None DEFAULT: None
example Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, although still supported. Use examples instead. TYPE: Any | None DEFAULT: _Unset
openapi_examples OpenAPI-specific examples. It will be added to the generated OpenAPI (e.g. visible at /docs). Swagger UI (that provides the /docs interface) has better support for the OpenAPI-specific examples than the JSON Schema examples, that's the main use case for this. Read more about it in the FastAPI docs for Declare Request Example Data. TYPE: dict[str, Example] | None DEFAULT: None
deprecated Mark this parameter field as deprecated. It will affect the generated OpenAPI (e.g. visible at /docs). TYPE: deprecated | str | bool | None DEFAULT: None
include_in_schema To include (or not) this parameter field in the generated OpenAPI. You probably don't need it, but it's available. This affects the generated OpenAPI (e.g. visible at /docs). TYPE: bool DEFAULT: True
json_schema_extra Any additional JSON schema data. TYPE: dict[str, Any] | None DEFAULT: None
**extra The extra kwargs is deprecated. Use json_schema_extra instead. Include extra fields used by the JSON Schema. TYPE: Any DEFAULT: {}
Source code in fastapi/param_functions.py
def Form(  # noqa: N802
    default: Annotated[
        Any,
        Doc(
            """
            Default value if the parameter field is not set.
            """
        ),
    ] = Undefined,
    *,
    default_factory: Annotated[
        Callable[[], Any] | None,
        Doc(
            """
            A callable to generate the default value.

            This doesn't affect `Path` parameters as the value is always required.
            The parameter is available only for compatibility.
            """
        ),
    ] = _Unset,
    media_type: Annotated[
        str,
        Doc(
            """
            The media type of this parameter field. Changing it would affect the
            generated OpenAPI, but currently it doesn't affect the parsing of the data.
            """
        ),
    ] = "application/x-www-form-urlencoded",
    alias: Annotated[
        str | None,
        Doc(
            """
            An alternative name for the parameter field.

            This will be used to extract the data and for the generated OpenAPI.
            It is particularly useful when you can't use the name you want because it
            is a Python reserved keyword or similar.
            """
        ),
    ] = None,
    alias_priority: Annotated[
        int | None,
        Doc(
            """
            Priority of the alias. This affects whether an alias generator is used.
            """
        ),
    ] = _Unset,
    validation_alias: Annotated[
        str | AliasPath | AliasChoices | None,
        Doc(
            """
            'Whitelist' validation step. The parameter field will be the single one
            allowed by the alias or set of aliases defined.
            """
        ),
    ] = None,
    serialization_alias: Annotated[
        str | None,
        Doc(
            """
            'Blacklist' validation step. The vanilla parameter field will be the
            single one of the alias' or set of aliases' fields and all the other
            fields will be ignored at serialization time.
            """
        ),
    ] = None,
    title: Annotated[
        str | None,
        Doc(
            """
            Human-readable title.
            """
        ),
    ] = None,
    description: Annotated[
        str | None,
        Doc(
            """
            Human-readable description.
            """
        ),
    ] = None,
    gt: Annotated[
        float | None,
        Doc(
            """
            Greater than. If set, value must be greater than this. Only applicable to
            numbers.
            """
        ),
    ] = None,
    ge: Annotated[
        float | None,
        Doc(
            """
            Greater than or equal. If set, value must be greater than or equal to
            this. Only applicable to numbers.
            """
        ),
    ] = None,
    lt: Annotated[
        float | None,
        Doc(
            """
            Less than. If set, value must be less than this. Only applicable to numbers.
            """
        ),
    ] = None,
    le: Annotated[
        float | None,
        Doc(
            """
            Less than or equal. If set, value must be less than or equal to this.
            Only applicable to numbers.
            """
        ),
    ] = None,
    min_length: Annotated[
        int | None,
        Doc(
            """
            Minimum length for strings.
            """
        ),
    ] = None,
    max_length: Annotated[
        int | None,
        Doc(
            """
            Maximum length for strings.
            """
        ),
    ] = None,
    pattern: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
    ] = None,
    regex: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
        deprecated(
            "Deprecated in FastAPI 0.100.0 and Pydantic v2, use `pattern` instead."
        ),
    ] = None,
    discriminator: Annotated[
        str | None,
        Doc(
            """
            Parameter field name for discriminating the type in a tagged union.
            """
        ),
    ] = None,
    strict: Annotated[
        bool | None,
        Doc(
            """
            If `True`, strict validation is applied to the field.
            """
        ),
    ] = _Unset,
    multiple_of: Annotated[
        float | None,
        Doc(
            """
            Value must be a multiple of this. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    allow_inf_nan: Annotated[
        bool | None,
        Doc(
            """
            Allow `inf`, `-inf`, `nan`. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    max_digits: Annotated[
        int | None,
        Doc(
            """
            Maximum number of digits allowed for decimal values.
            """
        ),
    ] = _Unset,
    decimal_places: Annotated[
        int | None,
        Doc(
            """
            Maximum number of decimal places allowed for decimal values.
            """
        ),
    ] = _Unset,
    examples: Annotated[
        list[Any] | None,
        Doc(
            """
            Example values for this field.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md)
            """
        ),
    ] = None,
    example: Annotated[
        Any | None,
        deprecated(
            "Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, "
            "although still supported. Use examples instead."
        ),
    ] = _Unset,
    openapi_examples: Annotated[
        dict[str, Example] | None,
        Doc(
            """
            OpenAPI-specific examples.

            It will be added to the generated OpenAPI (e.g. visible at `/docs`).

            Swagger UI (that provides the `/docs` interface) has better support for the
            OpenAPI-specific examples than the JSON Schema `examples`, that's the main
            use case for this.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md#using-the-openapi_examples-parameter).
            """
        ),
    ] = None,
    deprecated: Annotated[
        deprecated | str | bool | None,
        Doc(
            """
            Mark this parameter field as deprecated.

            It will affect the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            """
            To include (or not) this parameter field in the generated OpenAPI.
            You probably don't need it, but it's available.

            This affects the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = True,
    json_schema_extra: Annotated[
        dict[str, Any] | None,
        Doc(
            """
            Any additional JSON schema data.
            """
        ),
    ] = None,
    **extra: Annotated[
        Any,
        Doc(
            """
            Include extra fields used by the JSON Schema.
            """
        ),
        deprecated(
            """
            The `extra` kwargs is deprecated. Use `json_schema_extra` instead.
            """
        ),
    ],
) -> Any:
    return params.Form(
        default=default,
        default_factory=default_factory,
        media_type=media_type,
        alias=alias,
        alias_priority=alias_priority,
        validation_alias=validation_alias,
        serialization_alias=serialization_alias,
        title=title,
        description=description,
        gt=gt,
        ge=ge,
        lt=lt,
        le=le,
        min_length=min_length,
        max_length=max_length,
        pattern=pattern,
        regex=regex,
        discriminator=discriminator,
        strict=strict,
        multiple_of=multiple_of,
        allow_inf_nan=allow_inf_nan,
        max_digits=max_digits,
        decimal_places=decimal_places,
        example=example,
        examples=examples,
        openapi_examples=openapi_examples,
        deprecated=deprecated,
        include_in_schema=include_in_schema,
        json_schema_extra=json_schema_extra,
        **extra,
    )
File(
    default=Undefined,
    *,
    default_factory=_Unset,
    media_type="multipart/form-data",
    alias=None,
    alias_priority=_Unset,
    validation_alias=None,
    serialization_alias=None,
    title=None,
    description=None,
    gt=None,
    ge=None,
    lt=None,
    le=None,
    min_length=None,
    max_length=None,
    pattern=None,
    regex=None,
    discriminator=None,
    strict=_Unset,
    multiple_of=_Unset,
    allow_inf_nan=_Unset,
    max_digits=_Unset,
    decimal_places=_Unset,
    examples=None,
    example=_Unset,
    openapi_examples=None,
    deprecated=None,
    include_in_schema=True,
    json_schema_extra=None,
    **extra
)
PARAMETER DESCRIPTION
default Default value if the parameter field is not set. TYPE: Any DEFAULT: Undefined
default_factory A callable to generate the default value. This doesn't affect Path parameters as the value is always required. The parameter is available only for compatibility. TYPE: Callable[[], Any] | None DEFAULT: _Unset
media_type The media type of this parameter field. Changing it would affect the generated OpenAPI, but currently it doesn't affect the parsing of the data. TYPE: str DEFAULT: 'multipart/form-data'
alias An alternative name for the parameter field. This will be used to extract the data and for the generated OpenAPI. It is particularly useful when you can't use the name you want because it is a Python reserved keyword or similar. TYPE: str | None DEFAULT: None
alias_priority Priority of the alias. This affects whether an alias generator is used. TYPE: int | None DEFAULT: _Unset
validation_alias 'Whitelist' validation step. The parameter field will be the single one allowed by the alias or set of aliases defined. TYPE: str | AliasPath | AliasChoices | None DEFAULT: None
serialization_alias 'Blacklist' validation step. The vanilla parameter field will be the single one of the alias' or set of aliases' fields and all the other fields will be ignored at serialization time. TYPE: str | None DEFAULT: None
title Human-readable title. TYPE: str | None DEFAULT: None
description Human-readable description. TYPE: str | None DEFAULT: None
gt Greater than. If set, value must be greater than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
ge Greater than or equal. If set, value must be greater than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
lt Less than. If set, value must be less than this. Only applicable to numbers. TYPE: float | None DEFAULT: None
le Less than or equal. If set, value must be less than or equal to this. Only applicable to numbers. TYPE: float | None DEFAULT: None
min_length Minimum length for strings. TYPE: int | None DEFAULT: None
max_length Maximum length for strings. TYPE: int | None DEFAULT: None
pattern RegEx pattern for strings. TYPE: str | None DEFAULT: None
regex Deprecated in FastAPI 0.100.0 and Pydantic v2, use pattern instead. RegEx pattern for strings. TYPE: str | None DEFAULT: None
discriminator Parameter field name for discriminating the type in a tagged union. TYPE: str | None DEFAULT: None
strict If True, strict validation is applied to the field. TYPE: bool | None DEFAULT: _Unset
multiple_of Value must be a multiple of this. Only applicable to numbers. TYPE: float | None DEFAULT: _Unset
allow_inf_nan Allow inf, -inf, nan. Only applicable to numbers. TYPE: bool | None DEFAULT: _Unset
max_digits Maximum number of digits allowed for decimal values. TYPE: int | None DEFAULT: _Unset
decimal_places Maximum number of decimal places allowed for decimal values. TYPE: int | None DEFAULT: _Unset
examples Example values for this field. Read more about it in the FastAPI docs for Declare Request Example Data TYPE: list[Any] | None DEFAULT: None
example Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, although still supported. Use examples instead. TYPE: Any | None DEFAULT: _Unset
openapi_examples OpenAPI-specific examples. It will be added to the generated OpenAPI (e.g. visible at /docs). Swagger UI (that provides the /docs interface) has better support for the OpenAPI-specific examples than the JSON Schema examples, that's the main use case for this. Read more about it in the FastAPI docs for Declare Request Example Data. TYPE: dict[str, Example] | None DEFAULT: None
deprecated Mark this parameter field as deprecated. It will affect the generated OpenAPI (e.g. visible at /docs). TYPE: deprecated | str | bool | None DEFAULT: None
include_in_schema To include (or not) this parameter field in the generated OpenAPI. You probably don't need it, but it's available. This affects the generated OpenAPI (e.g. visible at /docs). TYPE: bool DEFAULT: True
json_schema_extra Any additional JSON schema data. TYPE: dict[str, Any] | None DEFAULT: None
**extra The extra kwargs is deprecated. Use json_schema_extra instead. Include extra fields used by the JSON Schema. TYPE: Any DEFAULT: {}
Source code in fastapi/param_functions.py
def File(  # noqa: N802
    default: Annotated[
        Any,
        Doc(
            """
            Default value if the parameter field is not set.
            """
        ),
    ] = Undefined,
    *,
    default_factory: Annotated[
        Callable[[], Any] | None,
        Doc(
            """
            A callable to generate the default value.

            This doesn't affect `Path` parameters as the value is always required.
            The parameter is available only for compatibility.
            """
        ),
    ] = _Unset,
    media_type: Annotated[
        str,
        Doc(
            """
            The media type of this parameter field. Changing it would affect the
            generated OpenAPI, but currently it doesn't affect the parsing of the data.
            """
        ),
    ] = "multipart/form-data",
    alias: Annotated[
        str | None,
        Doc(
            """
            An alternative name for the parameter field.

            This will be used to extract the data and for the generated OpenAPI.
            It is particularly useful when you can't use the name you want because it
            is a Python reserved keyword or similar.
            """
        ),
    ] = None,
    alias_priority: Annotated[
        int | None,
        Doc(
            """
            Priority of the alias. This affects whether an alias generator is used.
            """
        ),
    ] = _Unset,
    validation_alias: Annotated[
        str | AliasPath | AliasChoices | None,
        Doc(
            """
            'Whitelist' validation step. The parameter field will be the single one
            allowed by the alias or set of aliases defined.
            """
        ),
    ] = None,
    serialization_alias: Annotated[
        str | None,
        Doc(
            """
            'Blacklist' validation step. The vanilla parameter field will be the
            single one of the alias' or set of aliases' fields and all the other
            fields will be ignored at serialization time.
            """
        ),
    ] = None,
    title: Annotated[
        str | None,
        Doc(
            """
            Human-readable title.
            """
        ),
    ] = None,
    description: Annotated[
        str | None,
        Doc(
            """
            Human-readable description.
            """
        ),
    ] = None,
    gt: Annotated[
        float | None,
        Doc(
            """
            Greater than. If set, value must be greater than this. Only applicable to
            numbers.
            """
        ),
    ] = None,
    ge: Annotated[
        float | None,
        Doc(
            """
            Greater than or equal. If set, value must be greater than or equal to
            this. Only applicable to numbers.
            """
        ),
    ] = None,
    lt: Annotated[
        float | None,
        Doc(
            """
            Less than. If set, value must be less than this. Only applicable to numbers.
            """
        ),
    ] = None,
    le: Annotated[
        float | None,
        Doc(
            """
            Less than or equal. If set, value must be less than or equal to this.
            Only applicable to numbers.
            """
        ),
    ] = None,
    min_length: Annotated[
        int | None,
        Doc(
            """
            Minimum length for strings.
            """
        ),
    ] = None,
    max_length: Annotated[
        int | None,
        Doc(
            """
            Maximum length for strings.
            """
        ),
    ] = None,
    pattern: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
    ] = None,
    regex: Annotated[
        str | None,
        Doc(
            """
            RegEx pattern for strings.
            """
        ),
        deprecated(
            "Deprecated in FastAPI 0.100.0 and Pydantic v2, use `pattern` instead."
        ),
    ] = None,
    discriminator: Annotated[
        str | None,
        Doc(
            """
            Parameter field name for discriminating the type in a tagged union.
            """
        ),
    ] = None,
    strict: Annotated[
        bool | None,
        Doc(
            """
            If `True`, strict validation is applied to the field.
            """
        ),
    ] = _Unset,
    multiple_of: Annotated[
        float | None,
        Doc(
            """
            Value must be a multiple of this. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    allow_inf_nan: Annotated[
        bool | None,
        Doc(
            """
            Allow `inf`, `-inf`, `nan`. Only applicable to numbers.
            """
        ),
    ] = _Unset,
    max_digits: Annotated[
        int | None,
        Doc(
            """
            Maximum number of digits allowed for decimal values.
            """
        ),
    ] = _Unset,
    decimal_places: Annotated[
        int | None,
        Doc(
            """
            Maximum number of decimal places allowed for decimal values.
            """
        ),
    ] = _Unset,
    examples: Annotated[
        list[Any] | None,
        Doc(
            """
            Example values for this field.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md)
            """
        ),
    ] = None,
    example: Annotated[
        Any | None,
        deprecated(
            "Deprecated in OpenAPI 3.1.0 that now uses JSON Schema 2020-12, "
            "although still supported. Use examples instead."
        ),
    ] = _Unset,
    openapi_examples: Annotated[
        dict[str, Example] | None,
        Doc(
            """
            OpenAPI-specific examples.

            It will be added to the generated OpenAPI (e.g. visible at `/docs`).

            Swagger UI (that provides the `/docs` interface) has better support for the
            OpenAPI-specific examples than the JSON Schema `examples`, that's the main
            use case for this.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](../tutorial/schema-extra-example.md#using-the-openapi_examples-parameter).
            """
        ),
    ] = None,
    deprecated: Annotated[
        deprecated | str | bool | None,
        Doc(
            """
            Mark this parameter field as deprecated.

            It will affect the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            """
            To include (or not) this parameter field in the generated OpenAPI.
            You probably don't need it, but it's available.

            This affects the generated OpenAPI (e.g. visible at `/docs`).
            """
        ),
    ] = True,
    json_schema_extra: Annotated[
        dict[str, Any] | None,
        Doc(
            """
            Any additional JSON schema data.
            """
        ),
    ] = None,
    **extra: Annotated[
        Any,
        Doc(
            """
            Include extra fields used by the JSON Schema.
            """
        ),
        deprecated(
            """
            The `extra` kwargs is deprecated. Use `json_schema_extra` instead.
            """
        ),
    ],
) -> Any:
    return params.File(
        default=default,
        default_factory=default_factory,
        media_type=media_type,
        alias=alias,
        alias_priority=alias_priority,
        validation_alias=validation_alias,
        serialization_alias=serialization_alias,
        title=title,
        description=description,
        gt=gt,
        ge=ge,
        lt=lt,
        le=le,
        min_length=min_length,
        max_length=max_length,
        pattern=pattern,
        regex=regex,
        discriminator=discriminator,
        strict=strict,
        multiple_of=multiple_of,
        allow_inf_nan=allow_inf_nan,
        max_digits=max_digits,
        decimal_places=decimal_places,
        example=example,
        examples=examples,
        openapi_examples=openapi_examples,
        deprecated=deprecated,
        include_in_schema=include_in_schema,
        json_schema_extra=json_schema_extra,
        **extra,
    )
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