Unlock Real-Time Debugging in Node.js with Node Inspector – Tips & Fixes

Since I started using Node.js, I have relied on Node Inspector for debugging, appreciating its real‑time breakpoint capabilities, remote debugging, live code editing, pre‑load breakpoints, and embeddable API.

However, after Node.js 6.4.x the tool stopped working because the built‑in --inspect flag covered most of its features, and Node Inspector received no updates for over six months.

Because --inspect remained experimental, I fixed the bugs so that Node Inspector can run on Node 6.x and 7.x again.

A major technical challenge was accessing variables inside closures that are not exposed publicly. For example, consider the following code:

(function(){
  var require = function(name){
    //
  }
  require('http');
})();

The solution (see the original article) shows how to obtain a reference to the require function without modifying the source.

Node Inspector 1.1.0 now also adds remote debugging, allowing you to debug a Node.js application running on a server directly from your local machine, provided the network connection is available.