from fastapi import FastAPI, Form
from pydantic import BaseModel

app = FastAPI()


class FormData(BaseModel):
    username: str
    password: str
    model_config = {"extra": "forbid"}


@app.post("/login/")
async def login(data: FormData = Form()):

                                "schema": {"$ref": "#/components/schemas/FormData"}
                            }
                        },
                        "required": True,
                    },
                }
            }
        },
        "components": {
            "schemas": {
                "FormData": {
                    "properties": {

from fastapi import FastAPI, Form
from pydantic import BaseModel

app = FastAPI()


class FormData(BaseModel):
    username: str
    password: str


@app.post("/login/")
async def login(data: FormData = Form()):

                                "schema": {"$ref": "#/components/schemas/FormData"}
                            }
                        },
                        "required": True,
                    },
                }
            }
        },
        "components": {
            "schemas": {
                "FormData": {
                    "properties": {

from pydantic import GetJsonSchemaHandler
from starlette.datastructures import URL as URL  # noqa: F401
from starlette.datastructures import Address as Address  # noqa: F401
from starlette.datastructures import FormData as FormData  # noqa: F401
from starlette.datastructures import Headers as Headers  # noqa: F401
from starlette.datastructures import QueryParams as QueryParams  # noqa: F401

    if (
        single_not_embedded_field
        and lenient_issubclass(first_field.type_, BaseModel)
        and isinstance(received_body, FormData)
    ):
        fields_to_extract = get_cached_model_fields(first_field.type_)

    if isinstance(received_body, FormData):
        body_to_process = await _extract_form_body(fields_to_extract, received_body)

    if single_not_embedded_field:

from fastapi import FastAPI, Form
from pydantic import BaseModel

app = FastAPI()


class FormData(BaseModel):
    username: str
    password: str
    model_config = {"extra": "forbid"}


@app.post("/login/")
async def login(data: Annotated[FormData, Form()]):
    return data
```