hayate

Hayate ecosystem: Start here · Production golden app · Tested compatibility

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• Every core change is tested against the public auth, fetch, MCP, OpenAPI, and generated Workers heads using the exact unpublished wheel — see docs/ecosystem-compatibility.md.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-0.11.2.tar.gz (55.9 kB view details)

Uploaded Source

Built Distribution

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

hayate-0.11.2-py3-none-any.whl (72.0 kB view details)

Uploaded Python 3

File details

Details for the file hayate-0.11.2.tar.gz.

File metadata

  • Download URL: hayate-0.11.2.tar.gz
  • Upload date:
  • Size: 55.9 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.14

File hashes

Hashes for hayate-0.11.2.tar.gz
Algorithm Hash digest
SHA256 bc31b3da65b0a0efad35c7f441409f14d433337127aa5e74319c097ccb9d5c29
MD5 7d47b8767d66621f2ed96a394e711b9e
BLAKE2b-256 1c3fbeb5e6d55ee8982d02e49025f305294c1520ef39787e5045592fd8742f61

See more details on using hashes here.

Provenance

The following attestation bundles were made for hayate-0.11.2.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-0.11.2-py3-none-any.whl.

File metadata

  • Download URL: hayate-0.11.2-py3-none-any.whl
  • Upload date:
  • Size: 72.0 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.14

File hashes

Hashes for hayate-0.11.2-py3-none-any.whl
Algorithm Hash digest
SHA256 5b778cee1288d86e707d73daec3303634e1d30770fa4cdad591516681bf52db7
MD5 f946a7ae860ff0a56c6571e3f4b9587e
BLAKE2b-256 5424f561d3b8063c6de3587ae7d536d4834dced8de07d4ba5e72b15ee78d50bf

See more details on using hashes here.

Provenance

The following attestation bundles were made for hayate-0.11.2-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

This release

0.11.2 This release

2 files

0.11.1

2 files

0.11.0

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