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I have a list of .js files and I have a single minified version of these files with the source map. The minified file has been created using UglifyJS

Is it possible to extract code of the individual js files from the minified file? maybe by reading the source map?

eg:

original files:
1)head.js
2)tail.js
3)stomach.js
4)liver.js

minified file (containing code of all of above files):
-> body.min.js

source map:
-> body.min.js.map

Is it possible to extract the minified code (string) of stomach.js from body.min.js?

I have a list of .js files and I have a single minified version of these files with the source map. The minified file has been created using UglifyJS

Is it possible to extract code of the individual js files from the minified file? maybe by reading the source map?

eg:

original files:
1)head.js
2)tail.js
3)stomach.js
4)liver.js

minified file (containing code of all of above files):
-> body.min.js

source map:
-> body.min.js.map

Is it possible to extract the minified code (string) of stomach.js from body.min.js?

• javascript
• node.js
• source-maps
• uglifyjs2

Share Improve this question Follow asked Mar 16, 2016 at 14:02 Imraan KhanImraan Khan 37511 gold badge33 silver badges99 bronze badges 3

• This is an interesting question. Can you provide a little context? Are you afraid someone else will reverse engineer your code? Are you trying to reverse engineer someone else's code? Have you lost the original files and are attempting to restore them from the minified versions? – JDB Commented Mar 16, 2016 at 14:08
• Basically I want to generate some code on runtime. the final code might not include code from all files. And I also want to avoid running a minification of the final code – Imraan Khan Commented Mar 16, 2016 at 14:18
• Then why bine the files in the first place? I think extracting code is going to be far more expensive then minifying it. If you minify each file individually, wouldn't that give you the best of both worlds? You can bine as needed without having to minify at runtime. – JDB Commented Mar 16, 2016 at 14:21

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Sorted by: Reset to default 11

This script will expand minified source (via give sourcemap), and recreate all the files; essentially mirroring the original source repo. Is this what you needed? Quick and dirty, but might do the trick. (only tested against sourcemaps derived from webpack)

https://gist.github./hooptie45/6f9a7e6251a120c8d2d04e75f9d73c0e#file-sourcemap-extract-rb

$ ./sourcemap-extract.rb site./assets/app.min.js.map ./tmp

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