De-obfuscate Javascript code to make it readable again

Question

I hate to bring this here, while doing the learning of obfuscating the JS code, I encoded my code and then over wrote the orginal one without any backup :) Following is my o

Answer 1

Here's a new automated tool, JSNice, to try to deobfuscate/deminify it. The tool even tries to guess the variable names, which is unbelievably cool. (It mines Javascript on github for this purpose.)

http://www.jsnice.org

Answer 2

Probably tools get outdated as time goes by, but I found https://lelinhtinh.github.io/de4js/ and it works great.

Your code becomes:

function call_func(_0x41dcx2) {
    var _0x41dcx3 = eval('(' + _0x41dcx2 + ')');
    var _0x41dcx4 = document.createElement('div');
    var _0x41dcx5 = _0x41dcx3.id;
    var _0x41dcx6 = _0x41dcx3.Student_name;
    var _0x41dcx7 = _0x41dcx3.student_dob;
    var _0x41dcx8 = '<b>ID:</b>';
    _0x41dcx8 += '<a href="/learningyii/index.php?r=student/view&amp; id=' + _0x41dcx5 + '">' + _0x41dcx5 + '</a>';
    _0x41dcx8 += '<br/>';
    _0x41dcx8 += '<b>Student Name:</b>';
    _0x41dcx8 += _0x41dcx6;
    _0x41dcx8 += '<br/>';
    _0x41dcx8 += '<b>Student DOB:</b>';
    _0x41dcx8 += _0x41dcx7;
    _0x41dcx8 += '<br/>';
    _0x41dcx4.innerHTML = _0x41dcx8;
    _0x41dcx4.setAttribute('class', 'view');
    $('#StudentGridViewId').find('.items').prepend(_0x41dcx4);
};

Kudos to the dev!

Answer 3

Here it is:

function call_func(input) {
    var evaled = eval('(' + input + ')');
    var newDiv = document.createElement('div');
    var id = evaled.id;
    var name = evaled.Student_name;
    var dob = evaled.student_dob;
    var html = '<b>ID:</b>';
    html += '<a href="/learningyii/index.php?r=student/view&amp; id=' + id + '">' + id + '</a>';
    html += '<br/>';
    html += '<b>Student Name:</b>';
    html += name;
    html += '<br/>';
    html += '<b>Student DOB:</b>';
    html += dob;
    html += '<br/>';
    newDiv.innerHTML = html;
    newDiv.setAttribute('class', 'view');
    $('#StudentGridViewId').find('.items').prepend(newDiv);
};

Answer 4

I have tried both of online jsbeautifier(jsbeautifier, jsnice), these tools gave me beautiful js code,

but couldn't copy for very large js (must be bug, when i copy, copied buffer contains only one character '-').

I found that only working solution was prettyjs:

http://www.thaoh.net/prettyjs/

Answer 5

Try this: http://jsbeautifier.org/

I tested with your code and worked as good as possible. =D

Answer 6

From the first link on google;

function call_func(_0x41dcx2) {
 var _0x41dcx3 = eval('(' + _0x41dcx2 + ')');
 var _0x41dcx4 = document['createElement']('div');
 var _0x41dcx5 = _0x41dcx3['id'];
 var _0x41dcx6 = _0x41dcx3['Student_name'];
 var _0x41dcx7 = _0x41dcx3['student_dob'];
 var _0x41dcx8 = '<b>ID:</b>';
 _0x41dcx8 += '<a href="/learningyii/index.php?r=student/view&amp; id=' + _0x41dcx5 + '">' + _0x41dcx5 + '</a>';
 _0x41dcx8 += '<br/>';
 _0x41dcx8 += '<b>Student Name:</b>';
 _0x41dcx8 += _0x41dcx6;
 _0x41dcx8 += '<br/>';
 _0x41dcx8 += '<b>Student DOB:</b>';
 _0x41dcx8 += _0x41dcx7;
 _0x41dcx8 += '<br/>';
 _0x41dcx4['innerHTML'] = _0x41dcx8;
 _0x41dcx4['setAttribute']('class', 'view');
 $('#StudentGridViewId')['find']('.items')['prepend'](_0x41dcx4);
};

It won't get you all the way back to source, and that's not really possible, but it'll get you out of a hole.