router.route('/').post((req, res) => {
  pool.query('INSERT INTO users SET ?', req.body, (err, result) => {
      if (err) throw err;
      res.status(201).send(`User added with ID: ${result.insertId}`);
  });
});

curl -d "username=Dinesh Chugtai&email=dinesh@piedpiper.com&password=test" http://localhost:4000/users

curl -X POST 'http://localhost:4000/users?username=johnsmith&email=john@smith.com&password=password'