user.client.js

let userlogin;
let userpassword;
let username;

//const displayList = require('./utils');

const setup = () => {
  username = document.getElementById('username');
  getUser();
  // document.getElementById('update').addEventListener('click', update);
  displayList();
  document.getElementById('logout').addEventListener('click', logout);
}
window.addEventListener('DOMContentLoaded', setup);

const getUser = async () => {
  const requestOptions = {
                           method :'GET',
                         };
  const response = await fetch('/me', requestOptions);
  if (response.ok) {
    const user = await response.json();
    username.textContent = user.name;
  }
  else {
    const error = await response.json();
    handleError(error);
  }
}

const displayList = async () => {
  const requestOptions = {
                           method : 'GET'
                         };
  const response = await fetch('/admin/items', requestOptions)
  const allShows = await response.json();

  //(ici : code  exploitation de allShows)
  const list = document.getElementById('list');
  list.textContent = '';
  allShows.forEach( show => addToList(show, list) );
}

const addToList = (show,list) => {
const node = document.createElement('div');
node.id = show._id;
node.textContent = `${show.description} (${show.places})`;
//
//node.addEventListener('mouseover', () => getTask(show._id));
//
const ticketsButton = document.createElement('button');
ticketsButton.className = 'ticket';
ticketsButton.addEventListener('click', ajoutTicketShow);
ticketsButton.textContent = '+1 tickets';
node.appendChild(ticketsButton);
//
list.appendChild(node);
}

const update =  async () => {
  const userData = { name : username.value };
  const body = JSON.stringify(userData);
  const requestOptions = {
                         method :'PUT',
                         headers : { "Content-Type": "application/json" },
                         body : body
                       };
  const response = await fetch('/user/me', requestOptions);
  if (response.ok) {
    const updatedUser = await response.json();