Byline:

jspm.dev native modules CDN for npm documentation.

Key links

Examples

  • https://jspm.dev/@babel/core
  • https://dev.jspm.io/react-dom@17.0.1/server
  • https://dev.jspm.io/react unpinned (dangerous), or https://dev.jspm.io/react@16 locked to major version which is still risky, or https://dev.jspm.io/react@16.5 which locks the minor version and still gets backwards-compatable bug fixes, or https://dev.jspm.io/react@16.5.0 for exact pinning.
  • https://dev.jspm.io/npm:react@16.5.0 with npm explicitly (you also get this sometimes when the server redirects you).

How it works

“All packages from npm are precomputed and served through jspm.dev and are available at their corresponding URLs.”

This service already gives you ES Module format for type="module" script tags, so you don’t need a flag to choose that.

You can find a minified and dev/prod versions of a package. See /npm:react@17.0.2/cjs/ for example.

If you want to add a source map, use the Generator. That lets you specify package names and then generate an import map, polyfill for import maps, and a script tag using your imports. In some cases, an import map is actually necessary to prevent imports within a loaded module from breaking.

CDN domains

These are two CDNs - with different content and purpose.

  • https://dev.jspm.io/recast - production
  • https://jspm.dev/recast - development and prototyping

The CDN docs explain the difference:

jspm.dev provides a modules CDN that does not require import maps, useful for quick prototyping in development, as any module can be loaded directly from the console or in a module script without any other steps being necessary.

Browse

See available builds.