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async · ASGI-native · typed

Veloce — Async Python Web Framework

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

Python 3.10+ MIT licensed Type-checked pip install veloceframework

Veloce framework (PyPI: veloceframework) is an ASGI-native, async-first Python web framework for building APIs and full-stack applications. It draws Flask-compatible patterns (g, flash, blueprints, @app.route) and FastAPI-style typed dependency injection together into one tree — without depending on either. Requires Python 3.10+.

app.py
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. New here? Why Veloce Exists explains the one-IR architecture the rest of the framework follows from.

Why Veloce

  • Fast by design

    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

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

  • Typed dependency injection

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

  • Batteries included

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

  • Validated, both ways

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

  • Honest tests

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

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