如何调试混淆的JavaScript？

Question

I need to debug obfuscated JavaScript like this example:

__d("DataStore",[],function(a,b,c,d,e,f){var g={},h=1;function i(l){if(typeof l=='string'){return 'str_'+l;}else return 'elem_'+(l.__FB_TOKEN||(l.__FB_TOKEN=[h++]))........

JavaScript debuggers embedded in MSIE, Opera and Chrome do not understand that JS uses semicolons and not CRLF as a line breaks; so it is impossible to debug a script like that, because entire function is located on one large line, and the debugger always highlights this one line disallowing me to see what part of code is actually executed.

Is there any way to debug JavaScript files that contain a very long line of code and don't use CRLF to separate code lines?

Answer 1

Chrome devtools“Scripts / Sources”窗格具有“漂亮打印”模式（在底部工具栏中查找{}按钮）。

Answer 2

Use a Javascript Beautifier to reformat the code and then debug the code.

Check out http://jsbeautifier.org/

Answer 3

Google Chrome has a "Pretty print" function that allows to reindent the code.

I don't normally use it, so I don't know since when it exists, but it's present in Chrome 21 dev.

Answer 4

There is no single solution for this. The first thing you can to to have something a bit more readable is to copy/paste the javascript code into http://jsbeautifier.org/