JavaScript Encode As

This extension allows you to encode strings in the JavaScript format (i.e. Unicode/Hex), similar to Burp's Convert-To but specifically for within JSON/JavaScript.

This can be useful for bypassing WAF's/web application validation, particularly if the value is later returned as is and read by JavaScript in the browser.

Three types of encoding are supported:

• Unicode (\uHHHH)
• Unicode Aware (\u{H-HHHHHH})
• Hex (\xHH)

Usage

You can use this extension in places where you can modify text. For example, Repeater, Intruder.

To use this extension, you can "Right-click -> Extensions -> JavaScript EncodeAs -> (Select encoding choice)".

Text should be encoded in JavaScript-friendly format.

Encoding choices

Unicode:

• Unicode Encode Non-Alpha (\u0061abcd)
  Unicode Encodes Non-Alpha Characters, for example:
  <script>alert(1)</script> -> \u003Cscript\u003Ealert\u00281\u0029\u003C\u002Fscript\u003E
• Unicode Encode All Characters (\u0061)
  Unicode Encodes All Characters, for example:
  <script>alert(1)</script> -> \u003C\u0073\u0063\u0072\u0069\u0070\u0074\u003E\u0061\u006C\u0065\u0072\u0074\u0028\u0031\u0029\u003C\u002F\u0073\u0063\u0072\u0069\u0070\u0074\u003E

Unicode aware:

• Unicode Aware Encode Non-Alpha (\u{61}abcd)
  Unicode Aware Encodes Non-Alpha Characters, for example:
  <script>alert(1)</script> -> \u{3c}script\u{3e}alert\u{28}1\u{29}\u{3c}\u{2f}script\u{3e}
• Unicode Aware Encode All Characters (\u{61})
  Unicode Aware Encodes All Characters, for example:
  <script>alert(1)</script> -> \u{3c}\u{73}\u{63}\u{72}\u{69}\u{70}\u{74}\u{3e}\u{61}\u{6c}\u{65}\u{72}\u{74}\u{28}\u{31}\u{29}\u{3c}\u{2f}\u{73}\u{63}\u{72}\u{69}\u{70}\u{74}\u{3e}

Hex:

• Hex Encode Non-Alpha (\x61abcd)
  Hex Encodes Non-Alpha Characters for example:
  <script>alert(1)</script> -> \x3Cscript\x3Ealert\x281\x29\x3C\x2Fscript\x3E
• Hex Encode All Characters (\x61)
  Hex Encodes All Characters for example:
  <script>alert(1)</script> -> \x3C\x73\x63\x72\x69\x70\x74\x3E\x61\x6C\x65\x72\x74\x28\x31\x29\x3C\x2F\x73\x63\x72\x69\x70\x74\x3E