How to find, where the Javascript keeps an Object I am interested in?

Question

There is a website, which does POST, and I want to know, where parameters are stored. I need it to hack them, edit before posting. Scripts are huge and obfuscated, so I can't find the Objects I need just by reading the source code.

I've tried to serialize the window with JSON.prune from this answer. The keyword, which I use to find, where the string I need is stored, was found near 40 times in 28 megabytes of text. And it is not very readable even after I found substrings. So maybe it is not the way to go.

I need something which would tell me:

• this substr has been detected in:
  -- the String window.bla_bla_bla.deepobject.bla[5].blabla.msg_to_post
  -- the String window.bla_bla_bla.deepobject.bla[3].and_here
  -- the String window.and_even_here
  -- etc.

Answer 1

First, find the function that send POST request.

Is request sent when you click button? visual event can help you find it.

Next, Read the function and overwrite it with your own.

If scripts are minified, use beautifier like this

Normally, with Chrome developer tool and visual event I got all thing want to know.