# cdnjs, what it is and how websites use it.

A free open-source CDN for JavaScript and CSS libraries, running on the Cloudflare network. Websites load libraries such as jQuery or Font Awesome from it.

- **Status:** Stable. Actively operated.
- **Category:** [Servers & Hosting](https://be1st.ai/technologies/server)
- **First release:** 2011
- **License:** MIT
- **Official website:** https://cdnjs.com
- **Documentation:** https://cdnjs.com/api
- **GitHub:** https://github.com/cdnjs/cdnjs
- **Page:** https://be1st.ai/technologies/server/cdnjs

## cdnjs on audited websites

1,019 of the 16,845 websites audited by be1st run cdnjs (6.0%). That ranks it #8 of the 34 technologies in Servers & Hosting we have seen in audits.

### Websites running cdnjs vs all websites

- **Web score:** 69 (all websites 72)
- **SEO:** 78 (all websites 79)
- **Security:** 53 (all websites 59)
- **Performance:** 61 (all websites 72)
- **AI Readiness:** 31 (all websites 31)

### Most used in Servers & Hosting

1. [Cloudflare](https://be1st.ai/technologies/server/cloudflare): 22% (3,772)
2. [Vercel](https://be1st.ai/technologies/server/vercel): 22% (3,635)
3. [Google CDN](https://be1st.ai/technologies/server/google-cdn): 16% (2,700)
4. [nginx](https://be1st.ai/technologies/server/nginx): 14% (2,284)
5. [OpenResty](https://be1st.ai/technologies/server/openresty): 10% (1,707)
6. [Apache HTTP Server](https://be1st.ai/technologies/server/apache-http-server): 9.3% (1,574)
7. [jsDelivr](https://be1st.ai/technologies/server/jsdelivr): 7.2% (1,221)
8. [cdnjs](https://be1st.ai/technologies/server/cdnjs): 6.0% (1,019)
9. [Netlify](https://be1st.ai/technologies/server/netlify): 5.8% (971)
10. [AWS CloudFront](https://be1st.ai/technologies/server/aws-cloudfront): 5.1% (859)

## Other technologies in Servers & Hosting

- [unpkg](https://be1st.ai/technologies/server/unpkg): 2.8% of websites
- [Fastly](https://be1st.ai/technologies/server/fastly): 1.6% of websites
- [BunnyCDN](https://be1st.ai/technologies/server/bunnycdn): 1.2% of websites
- [Microsoft IIS](https://be1st.ai/technologies/server/microsoft-iis): 1.0% of websites
- [LiteSpeed](https://be1st.ai/technologies/server/litespeed): <1% of websites
- [Caddy](https://be1st.ai/technologies/server/caddy): <1% of websites
- [Amazon S3](https://be1st.ai/technologies/server/amazon-s3): <1% of websites
- [Google Cloud](https://be1st.ai/technologies/server/google-cloud): <1% of websites
- [Varnish](https://be1st.ai/technologies/server/varnish): <1% of websites
- [Azure](https://be1st.ai/technologies/server/azure): <1% of websites
- [Hostinger CDN](https://be1st.ai/technologies/server/hostinger-cdn): <1% of websites
- [GitHub Pages](https://be1st.ai/technologies/server/github-pages): <1% of websites

[All 35 in Servers & Hosting](https://be1st.ai/technologies/server)

## Questions about cdnjs

### What is cdnjs?

A free open-source CDN for JavaScript and CSS libraries, running on the Cloudflare network. Websites load libraries such as jQuery or Font Awesome from it. The be1st catalog lists cdnjs under Servers & Hosting. License of cdnjs: MIT.

### How many websites use cdnjs?

1,019 of the 16,845 websites audited by be1st run cdnjs (6.0%), as of 8 Nov 2026.

### When was cdnjs first released?

cdnjs was first released in 2011.

### Is cdnjs still a modern choice?

cdnjs is a stable, mature choice rather than a new one. Actively operated.

### What are the alternatives to cdnjs?

Technologies that do the same job as cdnjs include Google CDN, jsDelivr, and unpkg.

Numbers: latest audit of each of 16,845 websites audited by be1st, as of 8 Nov 2026.