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Prototype isJSON() Method


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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>

To understand it in better way you can Try it yourself.



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