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Encoding URI

To encode URLs, use encodeURI() or encodeURIComponent(). To decode them, use decodeURI() or decodeURIComponent().

Note that encodeURIComponent does not escape the ' character. A common bug is to use it to create HTML attributes such as href='MyUrl', which could suffer an injection bug. If you are constructing HTML from strings, either use " instead of ' for attribute quotes, or add an extra layer of encoding (' can be encoded as %27).
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<!DOCTYPE html><html><body><script>

   // 1. Use encodeURI when you want a working URL.
   console.log(encodeURI(
            "http://www.google.com/a file with spaces.html"));   //http://www.google.com/a%20file%20with%20spaces.html   // 2. Use encodeURIComponent when you want to encode    // a URL parameter.
   var param1 = encodeURIComponent(
                                "http://example.com/?a=12&b=55");
   url = "http://domain.com/?param1=" + param1 +
            "&param2=99";
   console.log(url);
   /* http://domain.com/?param1=http%3A%2F%2Fexample.
       com%2F%3Fa%3D12%26b%3D55&param2=99 */
      console.log(decodeURIComponent(url));// http://domain.com/?param1=http://example.com/?// a=12&b= 55&param2=99 

</script></body><html>