I put a first alpha version of the PrettyPrint Fiddler2 plugin [1] online. There are still some problems with regular expressions and lines that don't end with a semicolon, and some unknown maybe...
How to install?
First install Fiddler2 [2], system requriements are Windows 2000 / XP / 2003 / Vista with Microsoft .NET Framework v2.0 or later.
Simple copy the extracted DLL [1] to %USERPROFILE%\Documents\Fiddler2\Scripts\. When you start Fiddler2 you will see the plugin running in the Fiddler Options -> Extensions tab, it will identify itself as MS.Tools.PrettyPrint.
Which response are reformatted?
Currently I have only implemented response content with content type of application/x-javascript or text/javascript. If the request path ends with .js I do the convertion, too.
If the plugin is reformatting the response it will add a custom http header X-Fiddler-Plugin with PrettyPrint as value.
Any feedback is welcome!! Use the contact form [3] to send me any error you get, if possible with a short example or the original public url of the file.