UNPKG ESM — Browser-ready ES modules from npm

esm.unpkg.com is currently in beta. It serves browser-ready ES modules from npm packages using UNPKG infrastructure. Use it when a package is not already published as browser-ready ESM and you want to load it directly in modern browsers without a build step.

https://esm.unpkg.com/:package@:version/:subpath

Example

Import packages from esm.unpkg.com in a module script:

<script type="module">
  import React from "https://esm.unpkg.com/react@18.3.1";
  import { createRoot } from "https://esm.unpkg.com/react-dom@18.3.1/client";

  createRoot(document.getElementById("root")).render(
    React.createElement("h1", null, "Hello from esm.unpkg.com")
  );
</script>

Usage

Omit the version to use the package's latest npm tag.
Use npm dist-tags, semver ranges, or exact versions in the URL.
Add ?target=es2022 to choose an output target.
Add ?dev for development builds.
Add ?meta to inspect resolved module metadata.

Documentation

The full reference — every parameter, stylesheet handling, and error format — lives in the browser modules guide on the main UNPKG site. This page is only a pointer; the guide is the canonical documentation.