tryzniak / unpkg

The CDN for everything on npm

unpkg

unpkg is a fast, global content delivery network for everything on npm. Use it to quickly and easily load any file from any package using a URL like:

unpkg.com/:package@:version/:file

Examples

Using a fixed version:

• unpkg.com/[email protected]/umd/react.production.min.js
• unpkg.com/[email protected]/umd/react-dom.production.min.js

You may also use a semver range or a tag instead of a fixed version number, or omit the version/tag entirely to use the latest tag.

• unpkg.com/react@^16/umd/react.production.min.js
• unpkg.com/react/umd/react.production.min.js

If you omit the file path (i.e. use a "bare" URL), unpkg will serve the file specified by the unpkg field in package.json, or fall back to main.

• unpkg.com/d3
• unpkg.com/jquery
• unpkg.com/three

Append a / at the end of a URL to view a listing of all the files in a package.

• unpkg.com/react/
• unpkg.com/lodash/

Query Parameters

?meta

Return metadata about any file in a package as JSON (e.g. `/any/file?meta`)

?module

Expands all ["bare" `import` specifiers](https://html.spec.whatwg.org/multipage/webappapis.html#resolve-a-module-specifier) in JavaScript modules to unpkg URLs. This feature is *very experimental*

Cache Behavior

The CDN caches files based on their permanent URL, which includes the npm package version. This works because npm does not allow package authors to overwrite a package that has already been published with a different one at the same version number.

URLs that do not specify a package version number redirect to one that does. This is the latest version when no version is specified, or the maxSatisfying version when a semver version is given. Redirects are cached for 5 minutes.

Browsers are instructed (via the Cache-Control header) to cache assets for 4 hours.

Feedback

If you think this is useful, we'd love to hear from you. Please reach out to @unpkg with any questions or concerns.

Sponsors

The project is sponsored by Cloudflare and Heroku.