hayate

A web-standards-first Python web framework, inspired by Hono.

hayate (疾風, "swift wind") brings the Fetch API model to Python. Everything you touch maps 1:1 to WHATWG / IETF web standards; Python-local protocols such as WSGI and ASGI are demoted to adapter-level implementation details.

  • Standards-first — Request / Response / Headers / URL follow WHATWG Fetch and URL semantics. Routing syntax is the WHATWG URLPattern standard (/books/:id), not a custom DSL.
  • Minimal, portable core — one pure-Python Unicode standards dependency; runs anywhere CPython or Pyodide runs.
  • Runtime-agnostic — the app core is a pure fetch(Request) -> Response function. ASGI servers, Cloudflare Python Workers, and AWS Lambda are thin adapters.
  • Async-first, typed — Python 3.12+.

Install

uv add hayate        # or: pip install hayate

Quickstart

from hayate import Hayate, HTTPException

app = Hayate()

@app.get("/books/:id")
async def show_book(c):
    book = BOOKS.get(c.req.param("id"))
    if book is None:
        raise HTTPException(404, title="Book not found")
    return c.json(book)

Run with any ASGI server:

uvicorn main:app

Testing without a server

The app core performs no I/O, so tests call it directly — no test client, no sockets:

async def test_show_book():
    res = await app.request("/books/1")
    assert res.status == 200
    assert (await res.json())["id"] == "1"

Runtime-bound CORS allowlists can inspect the request context:

from hayate.middleware import cors

app = Hayate(env={"CORS_ORIGINS": {"https://app.example.com"}})

def allowed_origin(c, request_origin):
    return request_origin if request_origin in c.env["CORS_ORIGINS"] else None

app.use(cors(origin_resolver=allowed_origin, credentials=True))

Conformance and performance, measured

  • Standards conformance runs against vendored web-platform-tests vectors on every pytest run, with ratcheted pass counts — see docs/conformance.md.
  • A locked, end-to-end benchmark measures the same workload against FastAPI, Django, and Hono across startup, dependencies, deployment payload, cold start, throughput, and an HTTP contract. Framework-only ASGI overhead is also benchmarked against Starlette — see docs/benchmarks.md.
  • Every core change is tested against the public auth, fetch, MCP, OpenAPI, and generated Workers heads using the exact unpublished wheel — see docs/ecosystem-compatibility.md.

Status

Alpha (0.11.x): the surface tracks DESIGN.md (Japanese) and may still move before 1.0. Changes are recorded in CHANGELOG.md; platform research lives in docs/research/.

The wider ecosystem adds authentication, MCP, OpenAPI, and a portable client-side fetch. See the hayatepy organization profile for the current compatibility matrix.

License

MIT

Project links

Data verified by PyPI on Jul 26, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Newer release available (0.16.0)

1 maintainer

PyPI data
Data sourced directly from PyPI's database.
Avatar for yhay81 from gravatar.com yhay81

Credits

Author: Yusuke Hayashi

GitHub Statistics

Data verified by PyPI on Jul 26, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python >=3.12

Tags

web framework asgi fetch urlpattern web-standards hono

Classifiers

Report project as malware

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

hayate-0.11.0.tar.gz (55.8 kB view details)

Uploaded Source

Built Distribution

If you're not sure about the file name format, learn more about wheel file names.

hayate-0.11.0-py3-none-any.whl (71.7 kB view details)

Uploaded Python 3

File details

Details for the file hayate-0.11.0.tar.gz.

File metadata

  • Download URL: hayate-0.11.0.tar.gz
  • Upload date:
  • Size: 55.8 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.14

File hashes

Hashes for hayate-0.11.0.tar.gz
Algorithm Hash digest
SHA256 fcdf6a85197c71ed3f428066d452146f4b8c59776791299ceb98c0f3da56303f
MD5 70698a38d566873d72fe0534ce816bfe
BLAKE2b-256 ad7a9b9a9699524584e8c62e90bc5b227a4ef594f9c2fff3ef473a5f76024a91

See more details on using hashes here.

Provenance

The following attestation bundles were made for hayate-0.11.0.tar.gz:

Publisher: release.yml on hayatepy/hayate

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file hayate-0.11.0-py3-none-any.whl.

File metadata

  • Download URL: hayate-0.11.0-py3-none-any.whl
  • Upload date:
  • Size: 71.7 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.14

File hashes

Hashes for hayate-0.11.0-py3-none-any.whl
Algorithm Hash digest
SHA256 f5287bce955ca2d851986be6be4d6c1212bfc5d92822ba93aebe23406cfd5e32
MD5 9b13d7620b79bcb4f1b28c28d21a0d9e
BLAKE2b-256 8053f8724a3663ed3ad376e6a94ef3c7ab316d8a4027660c577c3d0337cf16cc

See more details on using hashes here.

Provenance

The following attestation bundles were made for hayate-0.11.0-py3-none-any.whl:

Publisher: release.yml on hayatepy/hayate

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Release history Release notifications | RSS feed

0.16.0

2 files

0.15.3

2 files

0.15.2

2 files

0.15.1

2 files

0.15.0

2 files

0.14.0

2 files

0.13.0

2 files

0.12.1

2 files

0.12.0

2 files

0.11.2

2 files

0.11.1

2 files

This release

0.11.0 This release

2 files

0.10.0

2 files

0.8.1

2 files

0.8.0

2 files

0.7.0

2 files

0.6.0

2 files

0.5.0

2 files

0.4.1

2 files

0.4.0

2 files

0.3.2

2 files

0.3.1

2 files

0.3.0

2 files

Anthropic, PBC Visionary sponsor Bloomberg Visionary sponsor Hudson River Trading Visionary sponsor Meta Visionary sponsor NVIDIA Visionary sponsor Microsoft Sustainability sponsor Depot Continuous Integration AWS Cloud computing and Security Sponsor Datadog Monitoring Fastly CDN Google Download Analytics Sentry Error logging StatusPage Status page