esm.sh
Claim this toolServe NPM packages as modern ES modules directly in browsers and Deno, no build tools needed.
Free, no paid tier Visit Website Free Visit Website
Tracked since 2026
The Bottom Line
- Price
- Free, no paid tier. Compare plans
Key facts
- 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.
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
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 modern JavaScript features directly in the browser.
Available on: Web
Key Features
- Import NPM packages via HTTP URLs
- Support for import maps
- Supports NPM, JSR, GitHub, and pkg.pr.new registries
- On-the-fly transformation of .ts(x)/.vue/.svelte files
- Specify and alias dependencies via URL query parameters
- Configurable 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.
esm.sh by the numbers
| Metric | esm.sh | Peer median | Position (1 is best) |
|---|---|---|---|
| Free plan | Yes | 23 of 34 have one | n/a |
| Listed as an alternative to | 2 tools | 4 | #19 of 34 (joint) |
Each position is counted among the tools that have data for that row, as noted under it. All CDN data · How we compute this. Advertising and placement fees are not inputs to any position.
Cite this: Toolradar, “esm.sh by the numbers”, Oct 2026.
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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