Nested Async Callback example - check the console log

nestedAsyncCallbackExample.js

// requires https://gist.github.com/toddzebert/ca9b735f1fbcd627ddfead4a87378adb
var data = { id: 4 };
getAuth(data, function (res) {
  data.auth = res;
  getProfile(data, function (res) {
    data.profile = res;
    getFeed(data, function (res) {
      data.feed = res;
      console.log(data); // callback hell
    });
  });
});