batch-update-demo.js

const getNodeRepoDetails = () => 
  fetch('https://api.github.com/repos/nodejs/node').then(response => response.json());

const getGoRepoDetails = () => 
  fetch('https://api.github.com/repos/golang/go').then(response => response.json());

Promise.all([getNodeRepoDetails(), getGoRepoDetails()])
  .then(response => {
      const [ nodeResponse, goResponse ] = response;
      /* handle request response */ 
  })
  .catch(error => { /* handle request error */ });