async · ASGI-native · typed

Veloce

Fast, ergonomic async Python web framework. Routing, dependency injection, OpenAPI, WebSockets, templating, sessions, and a built-in test client — all in one tree.

Get started API reference

Why Veloce

• Fast by design

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  Built on raw asyncio with orjson and httptools. Handler signatures are inspected once at registration — no reflection on the request hot path.

• Radix-tree routing

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  Path parameters are matched and type-coerced during tree traversal, with built-in int, float, uuid, path, and custom converters.

• Typed dependency injection

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  Depends, Security, and SecurityScopes resolve from precompiled plans, including yield-style dependencies with teardown.

• Batteries included

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  OpenAPI 3.1, WebSockets, Server-Sent Events, background tasks, middleware, signed sessions, and signals — all in core.

• Validated, both ways

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  Pydantic v2 validates request bodies; response_model serialises and filters what goes back out.

• Honest tests

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  The in-memory TestClient drives the real ASGI surface — middleware, encoding, and cookies included.

A first look

from veloce import Veloce, Request

app = Veloce()


@app.get("/hello/{name}")
async def hello(name: str):
    return {"hello": name}


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8000)

Type-annotated path parameters are coerced automatically, dictionaries become JSON responses, and the route is registered on the radix tree at import time.

Read the getting-started guide