//-- Intent: verify that faxmessage with faxcode of 100000 exists --// $.ajax({ type: "GET", contentType: "application/json; charset=utf-8", headers: {"SwiftAPI-Key": "12345"}, url: "http://api.v4.swiftreach.com/api/Messages/Fax/Exists/100000", dataType: "json" success: function(result) { // Do something with the result } }); <!-- example return value --> true