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docs_src/path_operation_configuration/tutorial006_py310.py

from fastapi import FastAPI

app = FastAPI()


@app.get("/items/", tags=["items"])
async def read_items():
    return [{"name": "Foo", "price": 42}]


@app.get("/users/", tags=["users"])
async def read_users():
    return [{"username": "johndoe"}]


@app.get("/elements/", tags=["items"], deprecated=True)
async def read_elements():

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Thu Feb 12 13:19:43 GMT 2026

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github.com/tiangolo/fastapi

tests/test_strict_content_type_nested.py

inner_strict = APIRouter(prefix="/strict", strict_content_type=True)
inner_default = APIRouter(prefix="/default")


@inner_strict.post("/items/")
async def inner_strict_post(data: dict):
    return data


@inner_default.post("/items/")
async def inner_default_post(data: dict):
    return data


outer_router.include_router(inner_strict)
outer_router.include_router(inner_default)

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs_src/dependencies/tutorial006_py310.py

from fastapi import Depends, FastAPI, Header, HTTPException

app = FastAPI()


async def verify_token(x_token: str = Header()):
    if x_token != "fake-super-secret-token":
        raise HTTPException(status_code=400, detail="X-Token header invalid")


async def verify_key(x_key: str = Header()):
    if x_key != "fake-super-secret-key":
        raise HTTPException(status_code=400, detail="X-Key header invalid")
    return x_key

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

tests/test_http_connection_injection.py

from starlette.websockets import WebSocket

app = FastAPI()
app.state.value = 42


async def extract_value_from_http_connection(conn: HTTPConnection):
    return conn.app.state.value


@app.get("/http")
async def get_value_by_http(value: int = Depends(extract_value_from_http_connection)):
    return value


@app.websocket("/ws")
async def get_value_by_ws(

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs_src/generate_clients/tutorial002_py310.py

async def create_item(item: Item):
    return {"message": "Item received"}


@app.get("/items/", response_model=list[Item], tags=["items"])
async def get_items():
    return [
        {"name": "Plumbus", "price": 3},
        {"name": "Portal Gun", "price": 9001},
    ]


@app.post("/users/", response_model=ResponseMessage, tags=["users"])
async def create_user(user: User):

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs/en/docs/tutorial/stream-json-lines.md

///

### Non-async *path operation functions* { #non-async-path-operation-functions }

You can also use regular `def` functions (without `async`), and use `yield` the same way.

FastAPI will make sure it's run correctly so that it doesn't block the event loop.

As in this case the function is not async, the right return type would be `Iterable[Item]`:

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs_src/bigger_applications/app_an_py310/routers/items.py

    responses={404: {"description": "Not found"}},
)


fake_items_db = {"plumbus": {"name": "Plumbus"}, "gun": {"name": "Portal Gun"}}


@router.get("/")
async def read_items():
    return fake_items_db


@router.get("/{item_id}")
async def read_item(item_id: str):
    if item_id not in fake_items_db:
        raise HTTPException(status_code=404, detail="Item not found")

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs_src/custom_request_and_route/tutorial003_py310.py

            return response

        return custom_route_handler


app = FastAPI()
router = APIRouter(route_class=TimedRoute)


@app.get("/")
async def not_timed():
    return {"message": "Not timed"}


@router.get("/timed")
async def timed():
    return {"message": "It's the time of my life"}

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs_src/security/tutorial004_an_py310.py

    if user is None:
        raise credentials_exception
    return user


async def get_current_active_user(
    current_user: Annotated[User, Depends(get_current_user)],
):
    if current_user.disabled:
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user


@app.post("/token")
async def login_for_access_token(
    form_data: Annotated[OAuth2PasswordRequestForm, Depends()],

Created: Sun Apr 05 07:19:11 GMT 2026

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github.com/tiangolo/fastapi

docs_src/request_files/tutorial002_an_py310.py

app = FastAPI()


@app.post("/files/")
async def create_files(files: Annotated[list[bytes], File()]):
    return {"file_sizes": [len(file) for file in files]}


@app.post("/uploadfiles/")
async def create_upload_files(files: list[UploadFile]):
    return {"filenames": [file.filename for file in files]}


@app.get("/")
async def main():
    content = """
<body>

Created: Sun Apr 05 07:19:11 GMT 2026

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