async-await.js

'use strict';

var Promise = require('bluebird')
  , express = require('express');

var app = express();

async function getUsers () {
  return new Promise(function (resolve, reject) {
    resolve(['jane', 'john']);
  });
}

async function getAges () {
  return new Promise(function (resolve, reject) {
    resolve(['23', '43']);
  });
}

async function getData (url) {
  var users = await getUsers();
  var ages = await getAges();

  return {
    ages: ages,
    users: users
  };
}

app.get('/', function (req, res, next) {

  getData()
    .then((data) => {
      res.json(data);
    })
    .catch(next);
});

app.listen(3001, (err) => {
  if (err) {
    throw err;
  }

  console.log('listening on 3001');
});

Another way to do this which lets you get both users and ages in parallel is like this. (The error handling is a little annoying though. )

async function getData (url) {
  return Promise.props({
    ages: getAges(),
    users: getUsers()
  });
}

app.get('/', function (req, res, next) {
  let data;
  try {
    data = await getData();
  } catch (err) {
    return next(err);
  }
  res.json(data);
});