Wrong error on getting array and object from json

Tell us what’s happening:

the response is true as you asked me but i still get an error =>Your code should use bracket and dot notation to access the proper code name, and print “Loki” to the console.

Your code so far

document.addEventListener('DOMContentLoaded', function(){
  document.getElementById('getMessage').onclick = function(){
    const req = new XMLHttpRequest();
    req.open("GET",'/json/cats.json', true);
      const json = JSON.parse(req.responseText);
      document.getElementsByClassName('message')[0].innerHTML = json[2].codeNames[1];

      // Add your code below this line

      // Add your code above this line

body {
  text-align: center;
  font-family: "Helvetica", sans-serif;
h1 {
  font-size: 2em;
  font-weight: bold;
.box {
  border-radius: 5px;
  background-color: #eee;
  padding: 20px 5px;
button {
  color: white;
  background-color: #4791d0;
  border-radius: 5px;
  border: 1px solid #4791d0;
  padding: 5px 10px 8px 10px;
button:hover {
  background-color: #0F5897;
  border: 1px solid #0F5897;

<h1>Cat Photo Finder</h1>
<p class="message box">
The message will go here
<button id="getMessage">
  Get Message

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36.

Challenge: Access the JSON Data from an API

Link to the challenge:

it doesn’t seem you are printing anything to the console, there is not a console.log in your code