# jsr-io/jsr

The open-source package registry for modern JavaScript and TypeScript

Repository: https://github.com/jsr-io/jsr
Canonical: https://ross.abutalabs.com/products/jsr
Homepage: https://jsr.io
Language: Rust
License: MIT
License Family: permissive
Topics: javascript, registry, typescript
Last push: 2026-08-26T20:17:23+00:00

## Health v2 (maintenance only)
Score: 70/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 35, longevity 65
- inputs: {"age_days": 917, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2969, forks 172 (observed 2026-08-28T04:07:32.715638+00:00)

## What it is
JSR is the open-source package registry for modern JavaScript and TypeScript, serving as an npm-compatible alternative with native TypeScript support across multiple runtimes (Deno, Node.js, Bun, browsers). The repository contains the full source code for the registry service, including a Rust management API, a Fresh-based frontend running on Cloudflare Workers, and storage on Cloudflare R2 with PostgreSQL.

## Use cases
- publish a TypeScript package without build steps
- find an npm-compatible registry for ES modules
- host packages usable across Deno, Node, and Bun
- search for JavaScript and TypeScript packages
- self-host or contribute to a modern JS package registry
- auto-generate documentation from package source

## When to choose
- you publish TypeScript and want zero-configuration .d.ts distribution
- you need ESM-first packages that work across multiple JS runtimes
- you want npm backwards compatibility with a modern registry
- you want to contribute to or study the registry's infrastructure

## When to avoid
- you only need to consume existing npm packages with no TypeScript or ESM needs
- you require a fully self-hosted private registry out of the box (the code is tied to Cloudflare/GCP infrastructure)
- your toolchain depends on CommonJS-only workflows

## Facets
- artifact type: service
- maturity: active
- function: package-manager, api-framework, http-server, search-engine, documentation
- domain: developer-tools, web-development, apis
- platform: cloud, rust
- tags: package-registry, npm-compatibility, typescript-native, esm, deno, cloudflare-workers, self-hostable-registry, javascript, typescript, web-server, docker

## Member repositories
- jsr-io/jsr (main) score 70

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:32.715638+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 2026-08-30T07:31:45.128621+00:00, confidence not recorded.
  - readme: https://github.com/jsr-io/jsr (fetched 2026-08-28T04:07:32.715638+00:00, sha e67853a0d460)
  - homepage: https://jsr.io (fetched 2026-08-29T09:47:03.385929+00:00, sha fefcb1026089)
  - site_page: https://jsr.io/docs (fetched 2026-08-29T09:47:03.395775+00:00, sha 6adfe1cd470e)
  - site_page: https://jsr.io/docs/why (fetched 2026-08-29T09:47:03.400048+00:00, sha 57b4829ff032)
  - site_page: https://jsr.io/@sigmasd/jsr-mcp (fetched 2026-08-29T09:47:03.398153+00:00, sha 669931be8825)
- Data as of 2026-08-30T08:39:29.467469+00:00.