Tool to Unminify Decompress JavaScript

Question

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

User · Answer

Pretty Diff will beautify  pretty print  JavaScript in a way that conforms to JSLint and JSHint white space algorithms

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If one is in JS possibility of using Firefox is more  And if its Firefox add on is for rescue  Following one is particularly useful   https   addons mozilla org en-US firefox addon phoenix

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Most of the IDEs also offer auto-formatting features  For example in NetBeans  just press CTRL K

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If you have a Mac and TextMate - An easy alternative for formatting Javascript is    Open the file with Textmate  Click on   Bundles   JavaScript   Reformat Document Crack open a beer

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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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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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In Firefox  SpiderMonkey and Rhino you can wrap any code into an anonymous function and call its toSource method  which will give you a nicely formatted source of the function   toSource also strips comments   E  g     function         Say hello     var x    Hello    print x      toSource     Will be converted to a string   function          var x    Hello        print x       P  S   It s not an  online tool   but all questions about general beautifying techniques are closed as duplicates of this one

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click on these link for JS deminification  That will install on FF as extension that help you in debugging js at runtime   https   addons mozilla org en-US firefox addon javascript-deminifier eula 141018 src dp-btn-primary

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Got it  JSBeautifier does exactly this  and you even have options for the auto-formatting

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Try this one  with code coloration   http   labs swelen com tools javascript beauty html

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Similar to Stone s answer  but for Windows  NET developers   If you have Visual Studio and ReSharper - An easy alternative for formatting Javascript is    Open the file with Visual Studio  Click on ReSharper   Tools   Cleanup Code  Ctrl E  C   Select  Default  Reformat code   and click OK  Crack open a beer

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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 lt document forms length   i  20 for j 0 j lt document forms i  elements length   j  document forms i  elements j  removeAttribute  22readonly 22  document forms i  elements j  removeAttribute  22disabled 22

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Despite its miles-away-from-being-pretty interface  JSPretty is a good  free and online tool for making javascript source codes human-readable  You can enforce your preferred type of indentation and it can also detect obfuscation

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Wasn t really happy with the output of jsbeautifier org for what I was putting in  so I did some more searching and found this site  http   www centralinternet com br javascript-beautifier  Worked extremely well for me

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Can t you just use a javascript formatter  http   javascript about com library blformat htm

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I m not sure if you need source code  There is a free online JavaScript formatter at http   www blackbeltcoder com Resources JSFormatter aspx

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http   unminify appspot com  Great tools for unminify javascript and json

[javascript] Tool to Unminify / Decompress JavaScript

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