Quart-Schema is a Quart extension that provides schema validation and auto-generated API documentation. This is particularly useful when writing RESTful APIs.

Quart-Schema can use either msgspec or pydantic to validate.

Quart-Schema can validate an existing Quart route by decorating it with validate_querystring, validate_request, or validate_response. It can also validate the JSON data sent and received over websockets using the send_as and receive_as methods.

from dataclasses import dataclass
from datetime import datetime

from quart import Quart, websocket
from quart_schema import QuartSchema, validate_request, validate_response

app = Quart(__name__)
QuartSchema(app)

@dataclass
class Todo:
    task: str
    due: datetime | None

@app.post("/")
@validate_request(Todo)
@validate_response(Todo, 201)
async def create_todo(data: Todo) -> tuple[Todo, int]:
    ... # Do something with data, e.g. save to the DB
    return data, 201

@app.websocket("/ws")
async def ws() -> None:
    while True:
        data = await websocket.receive_as(Todo)
        ... # Do something with data, e.g. save to the DB
        await websocket.send_as(data, Todo)

The documentation is served by default at /openapi.json according to the OpenAPI standard, or at /docs for a SwaggerUI interface, or /redocs for a redoc interface, or /scalar for a Scalar interface. Note that there is currently no documentation standard for WebSockets.

Quart-Schema is developed on GitHub. If you come across an issue, or have a feature request please open an issue. If you want to contribute a fix or the feature-implementation please do (typo fixes welcome), by proposing a merge request.

The best way to test Quart-Schema is with Tox,

$ pip install tox
$ tox

this will check the code style and run the tests.

The Quart-Schema documentation is the best places to start, after that try searching stack overflow or ask for help on gitter. If you still can't find an answer please open an issue.