To install node in Ubuntu click here

For other platforms click here

npm install node-inspector (and optional npm install v8-profiler) will install the node-inspector module, perfect for step-by-step debug of node.js programs

Now run node-inspector & and start your node app as node --debug-brk app.js; open the page http://127.0.0.1:8080/debug?port=5858 on a webkit-based browser and see the magic.

If you want, you can use my nodebug that launch node-inspector, the application and google chrome in debug mode