Async Call template #js

asyncFetch.js

async function asyncCall(url) {
  return fetch(url)
    .then(response => response.json())
    .then(responseJson => {
      return responseJson;
    })
    .catch(error => {
      throw error;
    });
}

request.js

let req, json;
const url =
  "https://raw.githubusercontent.com/freeCodeCamp/ProjectReferenceData/master/GDP-data.json";

req = new XMLHttpRequest();
req.open("GET", url, true);
req.onload = () => {
  json = JSON.parse(req.responseText);
  doSomething(json);
};
req.send();