I want to make response json from php server but why when I ceck in online formatter json (https://jsonformatter.curiousconcept.com/#) it’s not json fromat. this is my code.

<?php
echo '{"statusCode" : "200", "statusMessage" : "Success", "userId" : "00021231", "fullName" : "Jhon Martien" }';
?>

reponse :
{"statusCode" : "200", "statusMessage" : "Success", "userId" : "00021231", "fullName" : "Jhon Martien" }