Async await, Promises and CallBack

handleNetworkCall.js

var fetch = require('node-fetch');

const apiUrl = 'https://jsonplaceholder.typicode.com/users';

//Async await method
var fetchUsers = async () => {
  var response = await fetch(apiUrl);
  var data = response.json();
  return data;
}

var userList = await fetchUsers();


//Promise method
var fetchUsersPromise = () => {
  return new Promise((resolve, reject) => {
      fetch(apiUrl)
        .then(response => response.json()
              .then(data => resolve(data))
              .catch(err => reject(err)))
        .catch(err => reject(err))
  })
}

fetchUsersPromise()
  .then(data => console.info('Users',data))
  .catch(err => console.error('err',err));

//Callback method
var fetchUsersCb = (cb) => {
  fetch(apiUrl)
    .then(response => response.json()
                     .then(data => cb(data)))
    .catch(err => cb(null))
}

fetchUserscb(data => console.info('Data',data));