es6 to retrieve a random card from any list on a Trello board

gistfile1.txt

let key='';
let token='';
let boardid='';
fetch('https://api.trello.com/1/boards/' + boardid + '/lists?key=' + key + '&token=' + token + '') 
  .then(response => response.json())
  .then(data => {
  randomList = data[Math.floor(Math.random()*data.length)];
  console.log(randomList);
  fetch('https://api.trello.com/1/lists/' + randomList.id + '/cards?key=' + key + '&token=' + token + '') 
  .then(response => response.json())
  .then(data => {
    console.log(data[Math.floor(Math.random()*data.length)].name);
  })  
});