Playground

hayate and its single standards dependency are pure Python, so they run under Pyodide — this page installs the real hayate wheel from PyPI into your browser and runs it. No server anywhere.

Edit the code and press Run. The first run downloads the Python runtime (~10 MB); after that it's instant.

from hayate import Hayate, HTTPException app = Hayate() BOOKS = {"1": {"id": "1", "title": "SICP"}} @app.get("/books/:id") async def show(c): book = BOOKS.get(c.req.param("id")) if book is None: raise HTTPException(404, title="Book not found") return c.json(book) res = await app.request("/books/1") print(res.status, await res.text()) missing = await app.request("/books/9") print(missing.status, await missing.text())

Run in your browser

Why this works

The playground is not a demo build. micropip.install("hayate") fetches the same py3-none-any wheel from PyPI that servers use; micropip resolves its single pure-Python UTS-46 dependency too. That portable wheel set is also what makes hayate run on Cloudflare Python Workers.