cdnjs

The free CDN for open source libraries.

cdnjs is a free, open-source, community-driven CDN that provides popular JavaScript, CSS, and font resources for use in web projects without a build step or package installation. Files are served from Cloudflare's global network, with support for HTTP/3, HTTP/2, QUIC, and Brotli and GZIP compression. The service is HSTS preloaded for HTTPS delivery, and Subresource Integrity hashes are provided for script and link tags.

Libraries are curated through community pull requests to the cdnjs/packages repository, where a JSON file describes the library. Once merged, automation picks up new versions published to npm or GitHub and handles minification, compression, SRI hash generation, and publishing automatically. The service also offers an API, a searchable library index, and a status page.

cdnjs is intended for developers who want to include web libraries directly via script or link tags. It is free to use, with no paid editions or usage-based plans described. Contributions are accepted through GitHub, and maintenance can be funded via GitHub Sponsors, Open Collective, or Patreon.

12 alternatives to cdnjs

Ranked by how well each tool replaces cdnjs: shared features, audience, price and popularity.

Fastly
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Covers 3 of 15 key features.
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Let's Encrypt
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jsDelivr
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ModSecurity
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CleanBrowsing
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Sucuri
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SiteLock
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Covers 5 of 15 key features.
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Comodo
Website security, endpoint protection and certificate services.
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WafDdos protectionCdn
51 out of 100 match$8.25/mo
CDNvideo
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Tencent EdgeOne
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CDNetworks
A global network built for performance.
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Shodan
Search Engine for the Internet of Everything
Covers 1 of 15 key features.
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