cdnjs
cdnjs serves JavaScript, CSS, and font resources for web projects.
What cdnjs is
cdnjs serves JavaScript, CSS, and font resources for web projects. Developers can add available libraries with a script or link tag, without a build step or npm install. Its catalog lists 4,616 libraries, which are added through community curation; the service does not provide on-demand access to arbitrary libraries. After a library is approved, automation checks npm or GitHub for updates and handles minification, compression, Subresource Integrity hash generation, and publishing. Files are delivered through Cloudflare’s global network, which cdnjs lists as having 330+ edge locations. Supported protocols and compression include HTTP/3, HTTP/2, QUIC, Brotli, and GZIP. cdnjs is HSTS preloaded and provides SRI hashes for script and link tags. Its API at https://api.cdnjs.com requires no authentication. The service is free, with the listed cdnjs plan at no cost. The site reports 12.5% of websites and 250 billion requests per month. Users can contribute through GitHub or support maintenance through GitHub Sponsors, Open Collective, or Patreon.
Good
- Free plan costs nothing.
- Libraries can be included without a build step or npm install.
- Provides SRI hashes for script and link tags.
- Supports HTTP/3, HTTP/2, QUIC, Brotli, and GZIP.
Watch out
- Only community-added libraries are served.
- No on-demand access to arbitrary libraries.
Who it suits
cdnjs suits web developers who want to include catalogued JavaScript, CSS, or font libraries directly in projects. Its API may also suit users who need programmatic access without authentication.
Verdict
cdnjs offers a free, curated catalog of web assets with direct script and link inclusion. Check that the library you need is in its catalog, since arbitrary libraries cannot be pulled on demand.
Plans and prices
From cdnjs's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| cdnjs | Free | Curated libraries added by the community · Free to use |
The facts
Each one read from cdnjs's own pages, with the date it was checked.
What it does
- API
- The API base URL is https://api.cdnjs.com and the site says no authentication is required.checked 9 Oct 2026
- Curation limit
- cdnjs serves libraries added by the community and does not provide on-demand pull-through access to arbitrary libraries.checked 9 Oct 2026
- Global delivery
- Files are served from Cloudflare's global network, which the site lists as having 330+ edge locations.checked 9 Oct 2026
- How to include assets
- Libraries can be included with a script or link tag, without a build step or npm install.checked 9 Oct 2026
- Integrations and sponsors
- The site credits Cloudflare for CDN infrastructure and project maintenance, Algolia for library search, DigitalOcean for infrastructure, and Statuspage, Sentry, and UptimeRobot for incident communication, error monitoring, and uptime monitoring.checked 9 Oct 2026
- Library catalog
- The browse page lists 4,616 available libraries.checked 9 Oct 2026
- Library updates
- After a library is approved and added, automation regularly checks npm or GitHub for new versions and handles minification, compression, SRI hash generation, and publishing.checked 9 Oct 2026
- Protocols and compression
- The service supports HTTP/3, HTTP/2, QUIC, Brotli, and GZIP compression.checked 9 Oct 2026
- Scale
- The site reports 12.5% of websites and 250 billion requests per month.checked 9 Oct 2026
- Security
- cdnjs is HSTS preloaded and provides Subresource Integrity hashes for script and link tags.checked 9 Oct 2026
- Support
- Users can contribute through GitHub and support maintenance through GitHub Sponsors, Open Collective, or Patreon.checked 9 Oct 2026
- What it does
- cdnjs serves JavaScript, CSS, and font resources for use in web projects.checked 9 Oct 2026
The company
- Founded
- 2011checked 28 Sep 2026
Money
- Free plan
- Yeschecked 24 Sep 2026
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