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cdnjs

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Free CDN for popular JavaScript libraries

CDNHosting & Deployment
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Reviews onG2
1 review tracked

The Bottom Line

Entry price

Free, no paid tier

Biggest pro

Free CDN for libraries

Biggest con

Dependency on third party

TL;DR - cdnjs

  • cdnjs is a free CDN that hosts popular JavaScript and CSS libraries for faster website loading
  • It provides instant access to thousands of open-source libraries with automatic optimization
  • Completely free to use, powered by Cloudflare infrastructure
Pricing: Free forever
Best for: Individuals & startups

What is cdnjs?

Editorial review
cdnjs hosts popular JavaScript libraries on a free, fast CDN. Instead of bundling common libraries or paying for hosting, link to cdnjs and get reliable, cached delivery worldwide. The library catalog covers most frontend dependencies. SRI hashes enable integrity verification. The network is fast globally. Developers building websites who need common libraries choose cdnjs for free, reliable hosting of frontend dependencies.

Available on: Web

how we evaluateSourcecdnjs.com ↗

Pros & Cons

Pros

  • Free CDN for libraries
  • Huge library collection
  • Good performance
  • Easy to use
  • Community driven

Cons

  • Dependency on third party
  • Version availability varies
  • No SLA
  • Security considerations
  • Self-hosting often better

Ratings Across the Web

5(1 reviews)

cdnjs holds an aggregate rating of 5 out of 5 from 1 reviews across G2, last checked March 18, 2026.

G21 reviews
5/5

Ratings aggregated from independent review platforms. Learn more

Key Features

CDNJavaScript librariesCSS frameworksFreeCloudflare backedOpen source

Pricing Plans

Pricing checked Aug 27, 2026

Most Popular

Free

Public CDN

  • Free JS libraries
  • Cloudflare-backed
  • Global edge
  • No signup
Calculate your costView full pricing

Is cdnjs worth the price?

100/100

The cdnjs pricing is exceptionally fair and generous, as it offers a completely free service.

There are no dollar amounts to compare, as all features are provided at no cost. This is best for any developer or project needing reliable, free access to popular JavaScript libraries.

Hidden Costs & Gotchas

No hidden costs; service is free

Potential reliance on third-party availability

No dedicated support channels

How cdnjs Compares to Competitors

cdnjs stands out by being entirely free, unlike commercial CDNs like Cloudflare or Fastly which offer free tiers but primarily focus on paid plans for advanced features and higher usage. While Cloudflare's free tier offers basic CDN services, cdnjs specifically focuses on library hosting without any usage limits or feature restrictions, making it a more straightforward and cost-effective solution for its niche.

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Best cdnjs Alternatives

Top alternatives based on features, pricing, and user needs.

BunnyCDN logo
BunnyCDNPaid

Fast and affordable content delivery network

4.8
Cloudflare logo
CloudflareFreemium

Internet security & performance

4.3
jsDelivr logo
jsDelivrFree

Free CDN for open source packages

3.9
See all CDN tools →

Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

cdnjs vs BunnyCDNHead-to-head: features, pricing, who winscdnjs vs CloudflareHead-to-head: features, pricing, who winscdnjs vs jsDelivrHead-to-head: features, pricing, who wins

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cdnjs FAQ

How does cdnjs help developers with website performance?

cdnjs hosts popular JavaScript libraries on a free, fast CDN, allowing developers to link to common libraries instead of bundling them. This provides reliable, cached delivery worldwide, which can improve website loading times and overall performance.

Which teams benefit most from using cdnjs?

Teams building websites that require common frontend dependencies can benefit from cdnjs. It offers a free and reliable hosting solution for these libraries, making it suitable for projects looking to optimize delivery without incurring hosting costs.

How is cdnjs priced?

cdnjs is entirely free to use, with no paid plans required. It provides its service of hosting popular JavaScript libraries on a CDN without any associated costs for developers.

Can cdnjs be used to verify the integrity of hosted libraries?

Yes, cdnjs supports Subresource Integrity (SRI) hashes, which enable integrity verification for the JavaScript libraries it hosts. This allows developers to ensure that the files delivered have not been tampered with.

What kind of trade-offs should be considered when using cdnjs?

When using cdnjs, developers should consider the dependency on a third party and that version availability can vary for some libraries. Additionally, it does not offer a Service Level Agreement (SLA) and has security considerations, with self-hosting often being a better option for critical applications.

How does cdnjs compare to jsDelivr for hosting JavaScript libraries?

cdnjs, like jsDelivr, provides a free CDN for popular JavaScript libraries, offering a vast collection and good performance. Both services aim to deliver frontend dependencies reliably, though specific library availability or network performance might differ between them.

Source: cdnjs.com

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