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Companion.JS (pronounced Companion dot JS or CJS) is a Javascript debugger for IE. The current version is 0.5.5.
Companion.JS adds the following features to IE :

Detailled javascript error reporting (call stack and real file name where the error occured).
"Firebug"-like Console API feature.
Javascript console feature useful to inspect javascript objects at runtime.
A toolbar icon to open the Companion.JS panel.

Download the installer, guaranteed spyware/malware free and packaged with a straightforward and complete un-installer.
(Download zipped intaller for people unable to download .exe files due to proxy limitations)

To be able to use Companion.JS you'll need to have a Microsoft script debugger installed. There are many cases where you already have this component install. To check if you need it see Installing Companion.JS for details.

Here are some screenshots :

Detailled Error reporting

In the top-left corner the notifying panel which pops-up when an error occurs in the current page if the Companion.JS panel is not open. At the bottom of the page...

Console API feature

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