async handlers in express

I've recently realized that you don't need promises support (missing in express 4.x) to use async/await.

Just write a normal handler as an async function and wrap everything in a try catch to handle errors:

app.get("/users", async (req, res, next) => {
  try {
    await authorizeUser(req, res);
    const users = await db.findAllUsers();
    res.json(users);
  } catch (err) {
    next(err);
  }
});