CODE EXAMPLE FOR JAVASCRIPT

how to check if json data is received in ajax response

$.ajax({
    url: '/my/script.ext',
    dataType: 'json',
    success: function(data, textStatus, jqXHR) { /*YAYE!!*/ },
    error: function(jqXHR, textStatus, errorThrown) { /*AWWW... JSON parse error*/ }
});