double quotes in returned json

You don't need to serialize into JSON yourself, this should do:

public JsonResult Test() {
  var employee = new Employee { FullName = "Homer Simpson" };
  return Json(employee, JsonRequestBehavior.AllowGet);
}

Your code effectively serializes it twice, which gives you a string result.

The valid response should actually be this:

{"FullName":"Homer Simpson"}

(without the surrounding quotes)

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