I am doing a ajax call from java script and Im trying to get json response from php, if I set dataType as JSON, ajax error block is getting executed if not success block is getting executed, without specifying dataType if I try to console.log the response in success block I am getting nothing

JS

let CurrentDate = Date();

console.log(CurrentDate);



jsonObject = {

   'TrackName' : 'Material Science',

    'TrackDesc' : 'Test Text Test Text Test Text Test Text Test Text Test Text Test Text ',

    'Timestamp' : CurrentDate

}

console.log(jsonObject);

$.ajax({

    type:'post',

    url:'../../../../PHP/adminScripts/addNewTrack.php',

    contentType: application/json,

    data: {trackDetails:jsonObject},

    dataType: json,

    success: function(response) {

        console.log('SUCCESS BLOCK');

        console.log(response);

    },

    error: function(response) {

        console.log('ERROR BLOCK');

        console.log(response);

    }

});

PHP

<?php

header('Content-type: application/json');

include('../connection.php');



if($_POST) {

$obj = $_POST['trackDetails'];



$TrackName = mysql_real_escape_string($obj['TrackName']);

$TrackDesc = mysql_real_escape_string($obj['TrackDesc']);

$TrackAdderID = 'Admin ';                  //$_SESSION[userID];

$Timestamp = mysql_real_escape_string($obj['Timestamp']);



$response_array['status'] = 'status123';

echo json_encode($response_array);

please help me figure out how to get json response to an ajax call in PHP