Simple Express API

app.js

/* eslint-disable */

const express = require('express');

const app = express();

app.use(express.json());

const db = {
  users: [
    {
      id: 1,
      name: 'John Doe',
    },
    {
      id: 2,
      name: 'Jane Doe'
    },
    {
      id: 3,
      name: 'Alex Song',
    },
  ],
};

class User {
  constructor(attr) {
    User.count += 1;
    this.id = User.count;
    this.name = attr.name;
  }

  static create(attr) {
    const user = new User(attr);
    User.table.push(user);
    return user;
  }

  static findById(id) {
    return User.table.find(user => user.id === id);
  }

  static all() {
    return User.table;
  }
}

User.table = db.users;
User.count = db.users.length;

app.get('/api/users', (req, res, next) => {
  res.status(200)
    .json({
      status: 'OK',
      data: User.all(),
    });
});

app.get('/api/users/:id', (req, res, next) => {
  const userId = parseInt(req.params.id, 10);
  const user = User.findById(userId);
  
  res.status(200)
    .json({
      status: 'OK',
      data: [user],
    });
});

app.post('/api/users', (req, res, next) => {
  const data = req.body;
  const newUser = User.create(data);

  res.status(201)
    .json({
      status: 201,
      data: [newUser],
    });
});

app.post('/api/users', (req, res, next) => {
  const data = req.body;
  const newUser = User.create(data);

  res.status(201)
    .json({
      status: 201,
      data: [newUser],
    });
});

module.exports = app;