unpkg is a fast, global [content delivery network](https://en.wikipedia.org/wiki/Content_delivery_network) for everything on [npm](https://www.npmjs.com/). Use it to quickly and easily load any file from any package using a URL like:
You may also use a [semver range](https://docs.npmjs.com/misc/semver) or a [tag](https://docs.npmjs.com/cli/dist-tag) instead of a fixed version number, or omit the version/tag entirely to use the `latest` tag.
<dd>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*</dd>
</dl>
### 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](https://github.com/npm/node-semver) 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](https://twitter.com/unpkg) with any questions or concerns.
### Sponsors
The project is sponsored by [Cloudflare](https://cloudflare.com) and [Heroku](https://heroku.com).
