RoughAverageDictionaries created by tohagan - https://repl.it/@tohagan/RoughAverageDictionaries

index.js

// This line is only needed for server-side NodeJS. 
// You should have fetch() available in your client-side browser.
const fetch = require('node-fetch');

// https://jsonplaceholder.typicode.com - Provides test JSON data
var urls = [
	'https://jsonplaceholder.typicode.com/todos/1',
	'https://jsonplaceholder.typicode.com/todos/2',
	'https://jsonplaceholder.typicode.com/posts/1',
	'https://jsonplaceholder.typicode.com/posts/2',
];

// Maps each URL into a fetch() Promise
var requests = urls.map(function(url){
  return fetch(url)
  .then(function(response) {
    // throw "uh oh!";  - test a failure
    return response.json();
  })  
});

// Resolve all the promises
Promise.all(requests)
.then((results) => {
  console.log(JSON.stringify(results, null, 2));
}).catch(function(err) {
  console.log("returns just the 1st failure ...")
  console.log(err);
})

Example use of Promise.all() to fetch URLs.