done(function (data) code example

Example 1: how to set json type jquery ajax

$.ajax({
    type: "POST",
    contentType: "application/json",
    url: 'http://localhost:16329/Hello',
    data: { name: 'norm' },
    dataType: "json"
});

Example 2: jquery ajax on fail

fail: function(xhr, textStatus, errorThrown){
	alert('request failed');
}