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docs_src/query_params_str_validations/tutorial012_an_py310.py

from typing import Annotated

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: Annotated[list[str], Query()] = ["foo", "bar"]):
    query_items = {"q": q}

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

docs_src/query_params/tutorial001_py310.py

from fastapi import FastAPI

app = FastAPI()

fake_items_db = [{"item_name": "Foo"}, {"item_name": "Bar"}, {"item_name": "Baz"}]


@app.get("/items/")
async def read_item(skip: int = 0, limit: int = 10):

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

docs_src/vibe/tutorial001_py310.py

from typing import Any

from fastapi import FastAPI

app = FastAPI()


@app.vibe(
    "/vibe/",
    prompt="pls return json of users from database. make no mistakes",
)

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

- Last Modified: Wed Apr 01 16:16:24 GMT 2026

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github.com/tiangolo/fastapi

docs_src/body_multiple_params/tutorial004_an_py310.py

    description: str | None = None
    price: float
    tax: float | None = None


class User(BaseModel):
    username: str
    full_name: str | None = None


@app.put("/items/{item_id}")
async def update_item(
    *,
    item_id: int,
    item: Item,
    user: User,
    importance: Annotated[int, Body(gt=0)],
    q: str | None = None,
):

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

- Last Modified: Sat Mar 18 12:29:59 GMT 2023

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github.com/tiangolo/fastapi

docs_src/server_sent_events/tutorial002_py310.py

items = [
    Item(name="Plumbus", price=32.99),
    Item(name="Portal Gun", price=999.99),
    Item(name="Meeseeks Box", price=49.99),
]


@app.get("/items/stream", response_class=EventSourceResponse)
async def stream_items() -> AsyncIterable[ServerSentEvent]:
    yield ServerSentEvent(comment="stream of item updates")
    for i, item in enumerate(items):

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

- Last Modified: Sun Mar 01 09:21:52 GMT 2026

- 686 bytes

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github.com/tiangolo/fastapi

docs_src/request_forms_and_files/tutorial001_an_py310.py

from typing import Annotated

from fastapi import FastAPI, File, Form, UploadFile

app = FastAPI()


@app.post("/files/")
async def create_file(
    file: Annotated[bytes, File()],
    fileb: Annotated[UploadFile, File()],
    token: Annotated[str, Form()],
):
    return {
        "file_size": len(file),
        "token": token,
        "fileb_content_type": fileb.content_type,

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

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

- 386 bytes

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github.com/tiangolo/fastapi

docs_src/custom_response/tutorial003_py310.py

from fastapi import FastAPI
from fastapi.responses import HTMLResponse

app = FastAPI()


@app.get("/items/")
async def read_items():
    html_content = """
    <html>
        <head>
            <title>Some HTML in here</title>
        </head>
        <body>
            <h1>Look ma! HTML!</h1>
        </body>
    </html>
    """

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

docs_src/header_param_models/tutorial001_py310.py


class CommonHeaders(BaseModel):
    host: str
    save_data: bool
    if_modified_since: str | None = None
    traceparent: str | None = None
    x_tag: list[str] = []


@app.get("/items/")
async def read_items(headers: CommonHeaders = Header()):

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

- Last Modified: Tue Sep 17 18:54:10 GMT 2024

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github.com/tiangolo/fastapi

tests/test_request_params/test_form/utils.py

from typing import Any


def get_body_model_name(openapi: dict[str, Any], path: str) -> str:
    body = openapi["paths"][path]["post"]["requestBody"]
    body_schema = body["content"]["application/x-www-form-urlencoded"]["schema"]

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

- Last Modified: Wed Dec 17 21:25:59 GMT 2025

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github.com/tiangolo/fastapi

docs/en/docs/index.md

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>Or use <code>async def</code>...</summary>

If your code uses `async` / `await`, use `async def`:

```Python hl_lines="7  12"

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

- Last Modified: Sat Mar 07 09:29:03 GMT 2026

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