I have downloaded distribution code from cs50. In that, what they written in inbox.js is executed only. What I have added to the inbox.js is not being executed. The code they have given:

document.addEventListener("DOMContentLoaded", function () {
  // Use buttons to toggle between views
  document
    .querySelector("#inbox")
    .addEventListener("click", () => load_mailbox("inbox"));
  document
    .querySelector("#sent")
    .addEventListener("click", () => load_mailbox("sent"));
  document
    .querySelector("#archived")
    .addEventListener("click", () => load_mailbox("archive"));
  document.querySelector("#compose").addEventListener("click", compose_email);

  // By default, load the inbox
  load_mailbox("inbox");
});

function compose_email() {
  // Show compose view and hide other views
  document.querySelector("#emails-view").style.display = "none";
  document.querySelector("#compose-view").style.display = "block";

  // Clear out composition fields
  document.querySelector("#compose-recipients").value = "";
  document.querySelector("#compose-subject").value = "";
  document.querySelector("#compose-body").value = "";
}

function load_mailbox(mailbox) {
  // Show the mailbox and hide other views
  document.querySelector("#emails-view").style.display = "block";
  document.querySelector("#compose-view").style.display = "none";

  // Show the mailbox name
  document.querySelector("#emails-view").innerHTML = `<h3>${
    mailbox.charAt(0).toUpperCase() + mailbox.slice(1)
  }</h3>`;

In load_mailbox function, I have added:

fetch(`/emails/${mailbox}`)
    .then((response) => response.json())
    .then((emails) => {
      console.log(emails);
    });

But when I clicked buttons to see if my console working or not. I do not see any results from my console. If I copy the code I added(fetch(...)) and paste it on the console, it works. How do I implement that when I click buttons the results printed in the console? I have searched source tab to see if my code is added or not. But source tab only shows the code what they(cs50) have provided, not mine. What changes should I have to make to my code so that source tab also loads my code? I have seen related questions and answers on this topic, but they do not work here.