esm.sh
Claim this toolServe NPM packages as modern ES modules directly in browsers and Deno, no build tools needed.
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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free, no paid tier
Biggest pro
Simplifies modern web development by removing build steps
Biggest con
Reliance on an external CDN for module delivery
TL;DR - esm.sh
- Serves NPM packages as ES modules directly to browsers/Deno.
- Eliminates the need for build tools and local package installations.
- Supports on-the-fly transformation of various file types and dependency management.
Pricing: Free forever
Best for: Individuals & startups
What is esm.sh?
esm.sh is a fast, smart, and global ESM CDN that allows developers to import NPM packages directly into their web applications or Deno projects using standard JavaScript module syntax. It eliminates the need for local installation, bundling, or complex build processes, simplifying modern web development.
This service supports various registries including NPM, JSR, GitHub, and pkg.pr.new, enabling flexible access to a vast ecosystem of modules. It also offers on-the-fly transformation of .ts(x), .vue, and .svelte files, dependency management through query parameters, aliasing, and configurable bundling strategies to optimize performance and control module behavior. With esm.sh, developers can streamline their workflow, reduce project setup complexity, and leverage the latest JavaScript features directly in the browser.
Available on: Web
Pros & Cons
Pros
- Simplifies modern web development by removing build steps
- Provides direct access to a vast ecosystem of NPM packages
- Optimizes performance through bundling and tree shaking options
- Supports various module registries for flexibility
Cons
- Reliance on an external CDN for module delivery
- URL-based configuration can become lengthy for complex setups
- Potential for issues if CDN experiences downtime or performance degradation
Key Features
Import NPM packages via HTTP URLsSupport for import mapsSupports NPM, JSR, GitHub, and pkg.pr.new registriesOn-the-fly transformation of .ts(x)/.vue/.svelte filesSpecify and alias dependencies via URL query parametersConfigurable bundling strategies (e.g., ?bundle=false, ?standalone, ?raw)Tree shaking for specific module exports
Pricing
Free
esm.sh is completely free to use with no hidden costs.
Reviews
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esm.sh FAQ
How does esm.sh simplify modern web development?
esm.sh simplifies modern web development by allowing developers to import NPM packages directly into their web applications or Deno projects using standard JavaScript module syntax. This eliminates the need for local installation, bundling, or complex build processes, streamlining the workflow.
Which teams would benefit most from using esm.sh?
Teams looking to reduce project setup complexity and leverage the latest JavaScript features directly in the browser would benefit most from esm.sh. It is particularly useful for developers who want to avoid build tools and access NPM packages via a CDN.
How does esm.sh compare to Skypack?
esm.sh, like Skypack, serves NPM packages as modern ES modules directly in browsers. However, esm.sh supports various registries including NPM, JSR, GitHub, and pkg.pr.new, offering flexible access to a broad ecosystem of modules.
What kind of files can esm.sh transform on-the-fly?
esm.sh offers on-the-fly transformation capabilities for .ts(x), .vue, and .svelte files. This allows developers to use these file types directly without needing a separate build step.
What are the trade-offs of using esm.sh for module delivery?
A trade-off of using esm.sh is the reliance on an external CDN for module delivery, which means potential for issues if the CDN experiences downtime or performance degradation. Additionally, URL-based configuration can become lengthy for complex setups.
How is esm.sh priced?
esm.sh is free to use, and no paid plan is required to access its features. This makes it an accessible option for developers needing an ESM CDN.
Can esm.sh manage dependencies for imported modules?
Yes, esm.sh can manage dependencies through query parameters. It also offers aliasing and configurable bundling strategies to optimize performance and control module behavior.
Source: esm.sh