rest_api.js

// server example
import { User } from './database'
route.get('/user', async (req, res) => {
  return await User.findOne({ username: req.body.username })
});

// browser GET/user?username=paco
// response 
{
  "data": {
    user: {
      username: "paco",
      lastanem: "Sakata",
      firstname: "Gintama",
      age: "26",
      coountry: "Japan"
    }
  }
}