Akamai CDN
Enterprise-grade CDN for app, API, and media delivery at global scale
jsDelivr
Global, free CDN delivering npm and GitHub assets at lightning speed
A production‑grade, free CDN that instantly serves files from npm, GitHub, and other sources with multi‑CDN redundancy, version fallback, and on‑the‑fly minification.
Overview
Overview
jsDelivr is a production‑grade CDN that delivers files from npm, GitHub, WordPress plugins and custom endpoints worldwide. It is free, has no bandwidth caps, and is built to survive the traffic of the largest sites.
Features
The service stores every requested file in permanent S3 storage, providing version fallback when a newer release removes a file. Multi‑CDN routing through Cloudflare and Fastly, powered by real‑user monitoring, selects the fastest provider per visitor and instantly fails over on outages. On‑the‑fly minification and source‑map generation give developers ready‑to‑use assets without a build step. Dedicated nodes near Chinese urban centers keep latency low for that market.
Getting Started
Integrate by replacing the origin URL with https://cdn.jsdelivr.net followed by the appropriate endpoint (e.g., /npm/package@1.2.3/file.js). No configuration, authentication, or server management is required—just reference the CDN URL in your HTML or build pipeline.
Highlights
Multi‑CDN architecture with Cloudflare and Fastly for optimal uptime
Permanent storage and version fallback to prevent 404s
Real‑user monitoring drives smart load‑balancing per visitor
On‑the‑fly minification with source‑map generation
Pros
- Free with unlimited bandwidth
- Zero‑configuration integration
- Global coverage including low‑latency nodes in China
- Robust failover across DNS, CDN providers, and origin servers
Considerations
- Relies on third‑party CDN providers for edge delivery
- No dedicated SLA or premium support options
- First‑time minification can add a short delay
- Cannot serve private or proprietary assets
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Fit guide
Great for
- High‑traffic public websites needing reliable asset delivery
- Developers who want instant CDN access to npm and GitHub files
- Open‑source package authors seeking automatic distribution
- Projects targeting a global audience, including China
Not ideal when
- Hosting private or licensed code not publicly available
- Enterprises requiring contractual uptime guarantees
- Applications needing custom edge logic or serverless functions
- Latency‑critical real‑time services preferring self‑hosted CDN
How teams use it
Load JavaScript libraries on a public website
Instant, cached delivery with automatic minification and version stability
Embed CSS from a GitHub repository in documentation
Fast, reliable styling without managing files locally
Serve WordPress plugin assets for a high‑traffic blog
Reduced load on origin servers and consistent global performance
Provide fallback for npm packages that may be removed
Ensures the site remains functional even if the upstream package is deleted
Tech snapshot
JavaScript100%
Frequently asked questions
How does jsDelivr handle a file that is removed from npm?
It serves the file from permanent storage, ensuring continuity even after removal.
Is there any bandwidth limit?
No, the service is free with unlimited bandwidth.
What CDNs does jsDelivr use?
Traffic is routed through Cloudflare and Fastly, with automatic failover.
Can I request minified versions of assets?
Adding ".min" generates a minified file on first request, then caches it for future use.
How does version fallback work?
If a requested version is missing, jsDelivr serves the most recent previous version automatically.
Project at a glance
Stable- Stars
- 6,136
- Watchers
- 6,136
- Forks
- 2,114
LicenseMIT
Repo age13 years old
Last commit10 months ago
Primary languageJavaScript
Last synced 3 hours ago