JavaScript unescape() Function

Prerequisite: JavaScript escape() Function

Below is the example of the unescape() function.

• Example:

  <script>
     // Special character encoded with
     // escape function
     document.write(unescape("Geeks%20for%20Geeks%21%21%21"));
  
     document.write("<br>");
  
     // Print encoded string using escape() function
     // Also include exceptions i.e. @ and .
     document.write(unescape("To%20contribute%20articles%20contact"+
                     "%20us%20atreview-team@geeksforgeeks.org"));
  </script>
• Output:

  Geeks for Geeks!!!
  To contribute articles contact us at 
  review-team@geeksforgeeks.org

The unescape() function in JavaScript takes a string as a parameter and uses to decode that string encoded by the escape() function. The hexadecimal sequence in the string is replaced by the characters they represent when decoded via unescape().

Syntax:

unescape(string)

Parameters: This function accepts a single parameter as mentioned above and described below:

• string: This parameters holds the string that will be decoded.
  

  Return value: This function returns a decoded string.

  Note: This function only decodes the special characters, this function is depricated.
  Exceptions: @ – + . / * _

  More example codes for the above function are as follows:
  Program 1:

  <script>
     // Special character encoded with
     // escape function
     var str = escape("Geeks for Geeks!!!");
     document.write("Encoded : " + str);
  
     // New Line
     document.write("<br>");
  
     // unescape() function
     document.write("Decoded : " + unescape(str))
  
     // New Line
     document.write("<br><br>");
  
     // The exception
     // @ and . not encoded.
     str = escape("To contribute articles contact us" +
                  "at review-team@geeksforgeeks.org")
     document.write("Encoded : " + str);
  
     // New Line
     document.write("<br>");
  
     // unescape() function
     document.write("Decoded : " + unescape(str))
  
  </script>

  Output:

  Encoded : Geeks%20for%20Geeks%21%21%21
  Decoded : Geeks for Geeks!!!
  
  Encoded : To%20contribute%20articles%20contact%20us%20at%20review-team@geeksforgeeks.org
  Decoded : To contribute articles contact us at review-team@geeksforgeeks.org
  

  Supported Browsers:

  • Google Chrome 1 and above
  • Edge 12 and above
  • Internet Explorer 3 and above
  • Mozilla Firefox 1 and above
  • Safari 1 and above
  • Opera 3 and above