Although originally designed for use with Node.js, it can also be used directly in the browser.
prod
Download the noder.js file (browser build is 7kb minified). And then use a script tag:
<script src="noder.js"></script>
The global variable noder becomes available after the above script tag.
dev
To simplify debugging during development, you can use noder-dev.js.
Download noder-dev.js and noder-dev.js.map. And then use a script tag:
<script src="noder-dev.js"></script>