# wasmerio/winterjs

Winter is coming... ❄️

Repository: https://github.com/wasmerio/winterjs
Canonical: https://ross.abutalabs.com/products/winterjs
Homepage: https://winterjs.org/
Language: JavaScript
License: MIT
License Family: permissive
Archived: true
Last push: 2026-03-17T18:35:03+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 72, release rhythm 35, longevity 76
- inputs: {"age_days": 1077, "days_push": 169, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3189, forks 59 (observed 2026-08-28T04:07:48.103609+00:00)

## What it is
WinterJS is a high-performance JavaScript server that executes Service Worker scripts following the WinterCG specification, built on SpiderMonkey and hyper. It can handle up to 100,000 requests per second and runs natively or via Wasmer, but is now deprecated in favor of Edge.js.

## Use cases
- run service worker scripts as an http server
- host wintercg-compatible javascript edge functions
- serve fetch handlers with a fast js runtime
- run javascript servers sandboxed with wasmer
- benchmark high-throughput js request handling

## When to choose
- you need a WinterCG-compliant service worker server today and can accept an unmaintained project
- you want extremely high request throughput on modest hardware
- you already use Wasmer and want sandboxed JS execution

## When to avoid
- starting a new project - it is deprecated in favor of Edge.js
- you need full Node.js API compatibility
- you require long-term support or active maintenance

## Facets
- artifact type: service
- maturity: abandoned
- function: http-server, web-framework, wasm
- domain: web-development, backend, developer-tools
- platform: windows, cli, wasm, self-hosted
- tags: javascript-runtime, service-workers, wintercg, spidermonkey, edge-computing, deprecated, rust, linux, macos

## Member repositories
- wasmerio/winterjs (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:48.103609+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:24:57.889094+00:00, confidence not recorded.
  - readme: https://github.com/wasmerio/winterjs (fetched 2026-08-28T04:07:48.103609+00:00, sha e4643f4586dc)
  - homepage: https://winterjs.org/ (fetched 2026-08-29T09:39:08.423606+00:00, sha dc0455d9aeea)
- Data as of 2026-08-30T08:39:29.467469+00:00.