What is a good Javascript debugging tool?

Question

Haven\'t touch javascript for 3 years. Just got a javascript project and wanted to know any new ways or tools emerged these years to debug javascript? I used alert 3 years

Answer 1

If you need IE7 debugging, use IE8 in compatibility view with developer tools.

Answer 2

I think a Visual Studio / IE8 combo is excellent. Beats Firebug for JavaScript debugging, IMO (and you, of course, use a framework like jQuery to handle crossbrowser issues).

Answer 3

You really need a crossbrowser toolkit. Here's mine:

• Gecko (Firefox) : Firebug
• Opera : Dragonfly
• WebKit (Safari / Chrome) : Web Inspector
• IE : Microsoft script debugger

EDIT:

IE 8 added some developer tools, but I haven't used them to any great extent.

EDIT:

If you haven't done JS development in a while I recommend saving yourself a lot of time debugging cross browser issues by browsing the compatibility tables on Peter-Paul Koch's excellent quirksmode site.

Answer 4

real programmers use printf() traces for debugging (kidding).

var de =true, bug =console.log||alert||(de=false)

de&&bug( "Enjoy!")

When not in debug mode, just do de=false. Minimal performance penalty