In my previous post, I talked about debugging Node.js applications. We use nodeunit to unit test our Node.js scripts and it’s useful to be able to debug those nodeunit tests as well.
So how do you do that? It’s quite simple. You follow the instructions in my previous post except instead of pointing the debugger to a Node.js script, you point to your nodeunit instance and then you point to your test.
For example, if nodeunit is installed under node_modules and your test is under test folder, here’s how you’d debug that using node-inspector:
node --debug-brk node_modules/nodeunit/bin/nodeunit test/myDummyTest.t.js
In this post, I want to outline how to debug Node.js applications. I tried a few different debug tools for Node.js but I found node-inspector to be a decent tool to debug Node.js applications.
First, install node-inspector:
npm install -g node-inspector
Start your Node.js application with –debug-brk which tells the debugger to pause your script on the first line:
node --debug-brk yourNodeApp.js
Go to http://127.0.0.1:8080?debug=port=5858. Last time I tried, IE did not work, so try with a non-IE browser.
At this point, you should see your Node.js script stopped on the first line. Click on scripts tab to see all your scripts and set breakpoints where ever you want and then step through your code like you normally would.