Updated PHP file for Category to not include item:

ServerFiles/Categories.php

@@ -23,6 +23,5 @@ $sth->setFetchMode(PDO::FETCH_ASSOC);
 
 $result = $sth->fetchAll();
 if (count($result) > 0) {
-    $json =  json_encode($result, JSON_UNESCAPED_UNICODE);
-    echo "{\"items\":" . $json . "}";
+    echo json_encode($result, JSON_UNESCAPED_UNICODE);
 }