Dev server for web applications

Usage no npm install needed!

<script type="module">
  import webDevServer from 'https://cdn.skypack.dev/@web/dev-server';


Web Dev Server

Dev Server for web applications, ideal for buildless es module workflows. Optionally supports simple code transformations.

  • Efficient browser caching for fast reloads
  • Transform code on older browsers for compatibility
  • Resolve bare module imports for use in the browser (--node-resolve)
  • Auto-reload on file changes with the (--watch)
  • History API fallback for SPA routing (--app-index index.html)
  • Plugin and middleware API for extensions
  • Powered by esbuild and rollup plugins

Web Dev server is the successor of es-dev-server

See our website for full documentation.


Install the dev server:

npm i --save-dev @web/dev-server

Basic commands

Start the dev server:

web-dev-server --node-resolve --open
wds --node-resolve --open

Run in watch mode, reloading on file changes:

web-dev-server --node-resolve --watch --open
wds --node-resolve --watch --open

Use history API fallback for SPA routing:

web-dev-server --node-resolve --app-index demo/index.html --open
wds --node-resolve --app-index demo/index.html --open

Transform JS to a compatible syntax based on user agent:

web-dev-server --node-resolve --open --esbuild-target auto
wds --node-resolve --open --esbuild-target auto

Example projects

Check out the example projects for a fully integrated setup.


See our website for full documentation.