sign.js

app.post('/api/login', (req, res) => {
  // Mock user
  const user = {
    id: 1,
    username: '1055984',
    email: '1055984@ucn.com'
  };

  jwt.sign({ user }, 'secretkey', 
  { expiresIn: '30s' }, (err, token) => {
    res.json({
      token
    });	
  });
});