router.post('', async (req, res) => {
  if (!req.body.name) {
    res.status(422).json({ error: 'isRequired', field: 'name' });
  }

  try {
    const user = await saveUser(req.body.name);
    res.send(user);
  } catch (err) {
    res.status(400).json({ err });
  }
});