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 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

User · Accepted Answer

Try this  http   jsbeautifier org   I tested with your code and worked as good as possible   D

User · Answer

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

User · Answer

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     lt b gt ID  lt  b gt      0x41dcx8      lt a href   learningyii index php r student view amp amp  id      0x41dcx5      gt      0x41dcx5     lt  a gt      0x41dcx8      lt br  gt      0x41dcx8      lt b gt Student Name  lt  b gt      0x41dcx8     0x41dcx6    0x41dcx8      lt br  gt      0x41dcx8      lt b gt Student DOB  lt  b gt      0x41dcx8     0x41dcx7    0x41dcx8      lt br  gt      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

User · Answer

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     lt b gt ID  lt  b gt        html      lt a href   learningyii index php r student view amp amp  id     id      gt     id     lt  a gt        html      lt br  gt        html      lt b gt Student Name  lt  b gt        html    name      html      lt br  gt        html      lt b gt Student DOB  lt  b gt        html    dob      html      lt br  gt        newDiv innerHTML   html      newDiv setAttribute  class    view            StudentGridViewId   find   items   prepend newDiv

User · Answer

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

[javascript] De-obfuscate Javascript code to make it readable again

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