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Are there any command line 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 might still be an issue.)
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You can't unminify a minified file. Minification is a desctructive operation and involves loss of information. For example, if you have a function with a descriptive name, after minifcation that name will be substitute with a meaningless one. There's no way to go back from this operation.
Use your JS URL to compress. Click on the URL button, Enter URL and Submit. Users can also minify JS File by uploading the file. Minify JS Online works well on Windows, MAC, Linux, Chrome, Firefox, Edge, and Safari.
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/)
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Chrome developer tools has this feature built-in. Bring up the developer tools (pressing F12 is one way), in the Sources tab, the bottom left bar has a set of icons. The "{}" icon is "Pretty print" and does this conversion on demand.
UPDATE: IE9 "F12 developer tools" also has a "Format JavaScript" feature in the Script tab under the Tools icon there. (see Tip #4 in F12 The best kept web debugging secret)
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