De-obfuscate Javascript code to make it readable again

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 obfuscated code.

var _0xf17f=["\x28","\x29","\x64\x69\x76","\x63\x72\x65\x61\x74\x65\x45\x6C\x65\x6D\x65\x6E\x74","\x69\x64","\x53\x74\x75\x64\x65\x6E\x74\x5F\x6E\x61\x6D\x65","\x73\x74\x75\x64\x65\x6E\x74\x5F\x64\x6F\x62","\x3C\x62\x3E\x49\x44\x3A\x3C\x2F\x62\x3E","\x3C\x61\x20\x68\x72\x65\x66\x3D\x22\x2F\x6C\x65\x61\x72\x6E\x69\x6E\x67\x79\x69\x69\x2F\x69\x6E\x64\x65\x78\x2E\x70\x68\x70\x3F\x72\x3D\x73\x74\x75\x64\x65\x6E\x74\x2F\x76\x69\x65\x77\x26\x61\x6D\x70\x3B\x20\x69\x64\x3D","\x22\x3E","\x3C\x2F\x61\x3E","\x3C\x62\x72\x2F\x3E","\x3C\x62\x3E\x53\x74\x75\x64\x65\x6E\x74\x20\x4E\x61\x6D\x65\x3A\x3C\x2F\x62\x3E","\x3C\x62\x3E\x53\x74\x75\x64\x65\x6E\x74\x20\x44\x4F\x42\x3A\x3C\x2F\x62\x3E","\x69\x6E\x6E\x65\x72\x48\x54\x4D\x4C","\x63\x6C\x61\x73\x73","\x76\x69\x65\x77","\x73\x65\x74\x41\x74\x74\x72\x69\x62\x75\x74\x65","\x70\x72\x65\x70\x65\x6E\x64","\x2E\x69\x74\x65\x6D\x73","\x66\x69\x6E\x64","\x23\x53\x74\x75\x64\x65\x6E\x74\x47\x72\x69\x64\x56\x69\x65\x77\x49\x64"];function call_func(_0x41dcx2){var _0x41dcx3=eval(_0xf17f[0]+_0x41dcx2+_0xf17f[1]);var _0x41dcx4=document[_0xf17f[3]](_0xf17f[2]);var _0x41dcx5=_0x41dcx3[_0xf17f[4]];var _0x41dcx6=_0x41dcx3[_0xf17f[5]];var _0x41dcx7=_0x41dcx3[_0xf17f[6]];var _0x41dcx8=_0xf17f[7];_0x41dcx8+=_0xf17f[8]+_0x41dcx5+_0xf17f[9]+_0x41dcx5+_0xf17f[10];_0x41dcx8+=_0xf17f[11];_0x41dcx8+=_0xf17f[12];_0x41dcx8+=_0x41dcx6;_0x41dcx8+=_0xf17f[11];_0x41dcx8+=_0xf17f[13];_0x41dcx8+=_0x41dcx7;_0x41dcx8+=_0xf17f[11];_0x41dcx4[_0xf17f[14]]=_0x41dcx8;_0x41dcx4[_0xf17f[17]](_0xf17f[15],_0xf17f[16]);$(_0xf17f[21])[_0xf17f[20]](_0xf17f[19])[_0xf17f[18]](_0x41dcx4);} ;

Can anyone guide me the URL or any method to make it readable. I did this from this website and they seemingly provide on one way obfuscation services available on their website...this was my test code during a learning so would be greatful if anyone could help me out.

Try this: http://jsbeautifier.org/

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

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

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);
};

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.

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/

来源：https://stackoverflow.com/questions/12921713/de-obfuscate-javascript-code-to-make-it-readable-again

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javascript

deobfuscation