CODEWITHSUNDEEP
javascriptminify
ACP
ACP

Reputation: 35268

How can i get source from a minified javascript file?

I used online YUI Compressor for minifying my javascript file... Now i got minified version of it but i lost the source as i uploaded the source javascript file without taking a copy of it...

Upvotes: 6

Views: 18823

Answers (4)

austincheney
austincheney

Reputation: 1199

Here is an example where the referenced file is a minified file and automagically transformed into something legible:

http://prettydiff.com/?m=beautify&s=http://prettydiff.com/prettydiff.js

Upvotes: 1

grgry
grgry

Reputation: 173

I've used both the aforementioned

  • JavaScript unpacker and beautifier
  • JavaScript Beautifier

but i find the built-in Chrome Pretty print function in the Developer Tools to have been the the most consistent.

it's under the Scripts tab, in the icon menu alongside Pause on debug, Show/hide console, and Window docking

Upvotes: 1

Christian C. Salvadó
Christian C. Salvadó

Reputation: 827416

You will have to work hard, but as a starting point I would recommend you to reformat and reindent the code, there are out there some tools to do it:

That as I said, will give you a starting point, you will need to know the code well to rename your variables and functions properly.

The last option would be to consider a rewrite, which if you know exactly what your script is meant to do, can take less time than refactoring the minified source...

And at last but not least I would recommend you to work always with a version control system and do backups often...

Upvotes: 13

iBiryukov
iBiryukov

Reputation: 1740

Minified JS file is the source code in fact. It's just highly obfuscated. You can, for example, load this file into Aptana editor and hit ctrl+shift+f to format the source. Or use any other source code formater.

You will get your code structure back, but the variable/function/property names are lost forever.

Hard lesson :)

Upvotes: 2

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