cdnjs - The #1 free and open source CDN built to make life easier for developers
Simple. Fast. Reliable. Content delivery at its finest. cdnjs is a free and open-source CDN service trusted by over 12.5% of all websites, serving over 200 billion requests each month, powered by Cloudflare. We make it faster and easier to load library files on your websites.
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cdnjs is a free, open-source CDN that hosts thousands of JavaScript, CSS, and front-end libraries to make web development faster and easier for developers worldwide.
🚀 Overview
cdnjs is the #1 free and open-source content delivery network (CDN) for open-source front-end libraries, powered by Cloudflare. It allows developers to quickly include popular JavaScript, CSS, fonts, and frameworks in their websites without hosting the files themselves, leveraging global edge caching for speed and reliability.
Founded in 2011 by Ryan Kirkman and Thomas Davis, it partnered with Cloudflare early on and fully transferred to them in 2019. Today, it's community-maintained with over 1,400 contributors and serves over 12.5% of all websites, handling 200 billion requests monthly.
What problem does this project solve? Hosting libraries locally wastes bandwidth, slows load times, and requires maintenance; cdnjs provides instant, cached delivery worldwide. Who is it built for? Web developers, frontend teams, and anyone building websites or apps needing third-party assets. Why did you build it? To simplify developers' lives by offering a reliable, free alternative to self-hosting or limited commercial CDNs.
✨ Key Features
- Hosts 4,587+ popular libraries (e.g., jQuery, React, Bootstrap, Vue) with multiple versions, searchable via web or JSON API
- Ultra-fast global delivery powered by Cloudflare with HTTP/2, HTTPS, SRI support, and automatic caching
- Public JSON API (api.cdnjs.com) for querying libraries, versions, files, and metadata
- Community-driven updates: auto-sync for npm/GitHub releases, manual PRs for others; experimental auto-updates
🛠 Tech Stack
- Frontend: Vue.js, Nuxt.js, SCSS
- Backend: TypeScript, Cloudflare Workers
- Database: Cloudflare KV (for caching)
- Auth: None (public API)
- Hosting: Cloudflare
👥 Who Is This For?
This project is useful for:
- Developers who want to quickly link to libraries without self-hosting
- Teams looking for cost-free, high-performance CDN with massive uptime
- Indie makers building web apps needing reliable asset delivery
📸 Screenshots / Demo
- Live demo: https://cdnjs.com
- GitHub: https://github.com/cdnjs
🔥 Project Status
- 🟢 Actively building
Last updated: 2026-03-24
❓ FAQ
Is this project free?
Yes — completely free for unlimited use, open source.
Is the source code available?
Yes — https://github.com/cdnjs (key repos: cdnjs/assets, packages/metadata, static-website, api-server)
Can I contribute?
Yes — submit PRs to https://github.com/cdnjs/packages for new libraries or updates. Robot builds assets automatically. See CONTRIBUTING.md for details; donations via Open Collective.
📬 Contact & Links
- Website: https://cdnjs.com
- GitHub: https://github.com/cdnjs
- Twitter/X: https://x.com/cdnjs
- Email: Support via GitHub issues or https://opencollective.com/cdnjs
Built with ❤️ and kept warm on WarmIndex.
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