Prototype - isJSON() Method

This method checks if the string is valid JSON by the use of regular expressions. This security method is called internally.

Syntax

string.isJSON();

Return Value

Returns a boolean value.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var str = "something";
            alert("something.isJSON() : " + str.isJSON());
            
            var str = "\"something\"";
            alert("\"something\" : " + str.isJSON());
            
            var str = "{ foo: 42 }";
            alert("{ foo: 42 } : " + str.isJSON());
            
            var str = "{ \"foo\": 42 }";
            alert("{ \"foo\": 42 } : " + str.isJSON());
         }
      </script>
   </head>

   <body>
      <p>Click the button to see the result.</p>
      <br />
      <br />
      <input type = "button" value = "Result" onclick = "showResult();"/>
   </body>
</html>

Output

prototype_string_processing.htm