Skip to content
Toolradar
esm.run logo

esm.run

Unclaimed

Load modern JavaScript packages on-demand with global CDN performance.

CDNDeveloper ToolsHosting & Deployment
Visit Website
Reviews onCapterraSourceForge
72 reviews tracked

The Bottom Line

Entry price

Free, no paid tier

Biggest pro

Simplifies JavaScript module loading without a build step

Biggest con

Currently in beta for production use

TL;DR - esm.run

  • Delivers JavaScript modules on-demand via a global CDN.
  • Optimized for modern web browsers, Node.js, and Deno environments.
  • Utilizes advanced delivery technologies for high performance and uptime.
Pricing: Free forever
Best for: Individuals & startups
4.3/5 across review platforms

What is esm.run?

Editorial review
esm.run is a new-age Content Delivery Network (CDN) specifically designed for JavaScript modules. It allows developers to import modern JavaScript packages directly into their web browsers, Node.js, and Deno environments without needing a build step. The service dynamically builds packages on-demand and stores them permanently for fast future access. Powered by jsDelivr and its global network of sponsors like Cloudflare, Fastly, Bunny, and GCore, esm.run ensures high performance and uptime worldwide, including mainland China. It leverages state-of-the-art delivery optimizations such as HTTP/2, HTTP/3, code minification, Brotli compression, fine-tuned HTTP caching, and dependency preloading to improve overall performance. It's ideal for quick demos, prototyping, and eventually production use for serving JavaScript modules efficiently.

Available on: Web

how we evaluateSourceesm.run ↗

Pros & Cons

Pros

  • Simplifies JavaScript module loading without a build step
  • Ensures high performance and uptime globally
  • Utilizes advanced web delivery optimizations
  • Suitable for quick demos and prototyping
  • Free to use

Cons

  • Currently in beta for production use
  • Limited information available on the website beyond core functionality

Ratings Across the Web

4.3(72 reviews)
Capterra5 reviews
4.4/5
SourceForge67 reviews
4.3/5

Ratings aggregated from independent review platforms. Learn more

Key Features

On-demand JavaScript module buildsPermanent storage for built filesGlobal Multi-CDN powered by jsDelivrSupport for modern web browsers, Node.js, and DenoHTTP/2 and HTTP/3 deliveryCode minificationBrotli compressionFine-tuned HTTP caching

Pricing Plans

Free

Free

  • A New-Age CDN for JavaScript modules
  • Works in modern web browsers, node.js, and deno
  • Global Multi-CDN powered by jsDelivr
  • On-demand builds with permanent storage
  • State-of-the-art delivery (HTTP/2, HTTP/3, code minification, brotli compression, fine-tuned HTTP caching, dependency preloading)
Calculate your costView full pricing

Reviews

4.3/5

Across 72 verified user reviews on SourceForge, Capterra

Add your hands-on experience to help the next buyer.

Write a Toolradar review

Best esm.run Alternatives

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

View full list →
Statically logo
StaticallyFree

Accelerate static assets from Git repositories and npm packages via a global CDN.

4.3
jsDelivr logo
jsDelivrFree

Free CDN for open source packages

unpkg logo
unpkgFree

Instant CDN access to any npm package

Deno logo
DenoFreemium

The next-generation open-source JavaScript runtime for the modern web, built on web standards.

Skypack logo
SkypackFreemium

Search and load millions of open-source JavaScript packages optimized for browser use.

esm.sh logo
esm.shFree

Serve NPM packages as modern ES modules directly in browsers and Deno, no build tools needed.

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.

All esm.run alternatives6+ tools ranked, pricing + verdict per pickesm.run vs StaticallyHead-to-head: features, pricing, who winsesm.run vs jsDelivrHead-to-head: features, pricing, who winsesm.run vs unpkgHead-to-head: features, pricing, who wins

Explore More

Best CDN ToolsBest Developer Tools ToolsBest Hosting & Deployment ToolsBest Free CDNBest Free Developer ToolsBest Free Hosting & Deployment

esm.run FAQ

How does esm.run ensure high performance and uptime globally, including in mainland China?

esm.run is powered by jsDelivr and its sponsors, including Cloudflare, Fastly, Bunny, and GCore. This multi-CDN approach guarantees optimal performance and availability across the globe, extending to mainland China.

What happens to files after they are built by esm.run?

Once a file is built, it is stored in a permanent storage system that is shared by all edge servers. This ensures that subsequent access to these files will always be fast, even if they haven't yet been cached at a specific CDN edge.

What advanced delivery optimizations does esm.run utilize?

esm.run employs state-of-the-art delivery optimizations such as HTTP/2, HTTP/3, code minification, brotli compression, fine-tuned HTTP caching, and dependency preloading. These technologies are used to maximize overall performance.

Can esm.run be used for production applications?

esm.run links are suitable for quick demos or prototyping. While the production feature is currently in beta, it is recommended to use jsDelivr's main domain for production environments once this feature is officially released.

What environments are compatible with JavaScript modules loaded via esm.run?

JavaScript modules loaded through esm.run are designed to work in modern web browsers, Node.js, and Deno environments. This broad compatibility allows for flexible use across different development ecosystems.

Source: esm.run

Guides & Articles

Best AI Terminal Coding Agents in 2026

Expert guide

Best Code Editors & IDEs in 2026

Expert guide

Best Version Control Tools in 2026

Expert guide