Demystifying Async Programming in Javascript - fetchJson async await

fetchJson-async-await.js

async function () {
  var user = await fetchJson('/api/user/self');
  var interests = await fetchJson('/api/user/interests?userId=' + self.id);
  var recommendations = await Promise.all(
      interests.map(i => fetchJson('/api/recommendations?topic=' + i)));
  render(user, interests, recommendations);
}();

I think you want user instead of self in line 3