Available worldwide
What is JSR?
An open-source package registry for JavaScript and TypeScript that publishes ECMAScript modules natively. It works across multiple JavaScript runtimes including Node.js, Deno, Bun, and Cloudflare Workers, with built-in TypeScript support, automatic documentation generation, and interoperability with npm packages.
JSR pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
Free and open-source
Public
FreeFree public package registry
- Publish packages
- ECMAScript modules
- Automatic API documentation
- TypeScript support
- Cross-runtime compatibility
What JSR does
The capabilities that matter for package registries, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Role
- Public registry
- Ecosystem / language
- Polyglot
- Deployment
- SaaS
- Package formats supported
- Single ecosystem
- Private / scoped packages
- ✓
- Upstream proxy / caching
- -
- Lockfile / deterministic installs
- -
- Workspaces / monorepo
- -
- Content-addressable store
- -
- Supply-chain integrity
- ✓
- Vulnerability / licence scanning
- -
- Openness
- Open-source
- Pricing model
- Free / OSS
Platform & deployment
Independently observed- Web
- Cloud / SaaS
- Self-hosted
Integrations (7)
Independently observed- Node.js
- Deno
- Bun
- Cloudflare Workers
- npm
- Algolia
- GitHub•
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
JSR FAQ
Common questions about JSR, answered from independent, dated evidence.
What is JSR?
An open-source package registry for JavaScript and TypeScript that publishes ECMAScript modules natively. It works across multiple JavaScript runtimes including Node.js, Deno, Bun, and Cloudflare Workers, with built-in TypeScript support, automatic documentation generation, and interoperability with npm packages. It is indexed under Package Registries.
Source: https://jsr.io
Is JSR free to use?
JSR is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.
Source: https://jsr.io
What platforms does JSR support?
JSR supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://jsr.io
Can JSR be self-hosted?
Yes. JSR can be deployed cloud / SaaS and self-hosted, so it does not have to run on the vendor's infrastructure.
Source: https://jsr.io
What does JSR integrate with?
We have confirmed 6 integrations for JSR, including Node.js, Deno, Bun, Cloudflare Workers, npm and Algolia. This is what we could verify from public sources, so the vendor may support others we have not indexed.
Source: https://jsr.io
Is JSR open source?
Yes. JSR is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
Source: https://github.com/jsr-io/jsr
JSR alternatives
Other package registries we track, ranked by the same independent score.
- BunA unified JavaScript runtime with integrated package management, bundling, and testingmedium · 56%
- pnpmmedium · 65%
- VerdaccioA self-hosted npm registry with package caching and proxying capabilitieshigh · 78%
- RubyGemsThe public repository and package manager for Ruby codelow · 31%
- uvmedium · 62%
- pipPackage installer for Pythonmedium · 68%
Compare JSR
Side by side against other package registries, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for JSR, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Development activity | 56 | 0.11 | 6.0 | ✓ |
| Security score | 54 | 0.08 | 4.4 | ✓ |
| Capabilities | 46 | 0.09 | 4.0 | ✓ |
| Stars | 66 | 0.03 | 1.8 | ✓ |
| Integrations | 24 | 0.05 | 1.3 | ✓ |
| Dependent projects | 0 | 0.07 | 0.0 | ✓ |
| Release cadence | 0 | 0.07 | 0.0 | - |
| Security posture | 0 | 0.18 | 0.0 | - |
| Package downloads | 0 | 0.15 | 0.0 | - |
| Developer Q&A activity | 0 | 0.05 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 57 | mediumsource · 2026-09-10 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 6 items | mediumsource · 2026-09-10 · 66% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Role: public_registry · Ecosystem: polyglot · Deployment: saas · Open source: oss · Pricing model: free · Package formats: single | mediumsource · 2026-09-10 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 6 | mediumsource · 2026-08-14 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Rust | highsource · 2026-09-10 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-09-10 · 95% |
Market
| Attribute | Value | Evidence |
|---|---|---|
| Availability | PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: … | highsource · 2026-08-14 · 75% |
Pricing
Security
Is JSR the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank JSR against the rest of the package registries we index, using the same dated evidence weighted your way.
Free to run, no account needed to start. How the evaluation works
Is this your product?
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