AJAX: Check if a string is JSON?

If you include the JSON parser from json.org, you can use its parse() function and just wrap it in a try/catch, like so:

try
{
   var json = JSON.parse(this.responseText);
}
catch(e)
{
   alert('invalid json');
}

Something like that would probably do what you want.

Hers's the jQuery alternative...

try
{
  var jsonObject = jQuery.parseJSON(yourJsonString);
}
catch(e)
{
  // handle error 
}

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