JQuery getJSON call to MVC Controller

This can happen if the data return by the controller method is violating JSON format. You can try the following-

• Change ActionResult to JsonResult.
• Add [AcceptVerbs(HttpVerbs.Get)] to Filter method.
• Add {} as second paramenter of getJSON as it takes three parameter.

Its working fine with the following code-

    [AcceptVerbs(HttpVerbs.Get)]
    public JsonResult Filter()
    {
       var myData = new[] { new { first = "Murli", last = "D" }, new { first = "Deepak", last = "Tripathi" } };
       return Json(myData, JsonRequestBehavior.AllowGet);
    }

<script type="text/javascript">
$(document).ready(
    function () {
        $.getJSON(
        "/Account/Filter", {}, 
        function (myData) {
                alert(myData);
        });
});
</script>