Beautify, unpack or deobfuscate JavaScript..

All of the source code is available on the github, and we have a command-line version and a python library as well.

JSBeautifier is — and always will be — completely free and open, and your thanks, flattrs and donations are very heartwarming — thank you all so much!

Browser extensions and other uses:

• A bookmarklet (drag it to your bookmarks) by Ichiro Hiroshi to see all scripts used on the page,
• Chrome: jsbeautify-for-chrome by Tom Rix,
• Chrome: Pretty Beautiful JavaScript by Will McSweeney,
• Safari: Safari extension by Sandro Padin,
• Opera: Readable JavaScript (github) by Dither,
• Opera: Source extension by Deathamns,
• Fiddler proxy: JavaScript Formatter addon,
• gEdit tips by Fabio Nagao,
• Akelpad extension by Infocatcher,
• Beautifier in Emacs write-up by Seth Mason,
• Cloud9, a lovely IDE running in a browser, working in the node/cloud, uses jsbeautifier (github),
• Shrinker, a non-free JavaScript packer for Mac. I haven't used it, so I have no idea if it's any good.
• Doing anything interesting? Write me to einar@jsbeautifier.org and I'll include your link.