Online Tool to Unminify / Decompress JavaScript

Question

Are there any scripts and/or online tools that can reverse the effects of minification similar to how Tidy can clean up horrific HTML?

I'm specifically looking to unminify a minified JavaScript file, so variable renaming (like with compression or packing) should theoretically not be an issue.

Answer 1

You can use this : http://jsbeautifier.org/ But it depends on the minify method you are using, this one only formats the code, it doesn't change variable names, nor uncompress base62 encoding.

edit: in fact it can unpack "packed" scripts (packed with Dean Edward's packer : http://dean.edwards.name/packer/)

Answer 2

Can't you just use a javascript formatter (http://javascript.about.com/library/blformat.htm) ?

Answer 3

As an alternative (since I didn't know about jsbeautifier.org until now), I have used a bookmarklet that reenabled the decode button in Dean Edward's Packer.

I found the instructions and bookmarklet here.

here is the bookmarklet (in case the site is down)

javascript:for%20(i=0;i<document.forms.length;++i)%20{for(j=0;j<document.forms[i].elements.length;++j){document.forms[i].elements[j].removeAttribute(%22readonly%22);document.forms[i].elements[j].removeAttribute(%22disabled%22);}}