Ajax show error on php json_encode

Question

I am trying to get data from a json array that is populated by a php file. The data passes successfully to the php file, but it returns errors. I tried to inspect the page, it shows the returned arrays in the network element as shown in the picture Network inspection element , but the ajax success function won't work. If the data were passed successfully from the php file, why isn't execute the ajax successful function?
This is my ajax code:

var a = $(this).attr('idq');
$.ajax({
    type: "POST",
    url: "try.php",
    data: {
     queryy: a
    },

    dataType: "json",
    success: function(result) {

     var data = jQuery.parseJSON(result);
     $.each(data, function(index, value) {
         alert("successful");
     });

    },

    error: function(result) {
     alert("error");
    }
});

Answer 1

If you give the dataType as json , then no need for parseJSON . Just remove the jQuery.parseJSON() from your code.

Answer 2

dataType:"json" tells jQuery to parse the response as JSON.

Therefore, you're passing an actual object to jQuery.parseJSON , which won't work