Express vs Koa vs Hapi - REST APIs

Express-rest-apis.js

// Expressjs REST APIs
const express = require('express');
const app = express();
cosnt router = express.Router();    

let getUsersHandler = (req, res, next)=> {
    //fetch users from database via ORM
    res.send('Get - list users');
  }

let creatUserHandler = (req, res, next)=> {
    // Store user data via ORM
    console.log('post', req.body)
    res.send('Post- User successfully created');
  }

let getUserHandler = (req, res, next)=> {
    // fetch user details via ORM
    console.log('User id:', req.params.id)
    res.send('Get- User id: ' + req.params.id);
  }

let updateUserHandler = (req, res, next)=> {
    // update user details via ORM
    console.log('User id:', req.params.id)
    res.send('Put- User id: ' + req.params.id);
  }

let deleteUserHandler = (req, res, next)=> {  
    // delete user via ORM
    console.log('User id:', req.params.id)
    res.send('Delete User id: ' + req.params.id);
  }

router.route('/users')
  .get(getUsersHandler)
  .post(creatUserHandler);

router.route('/users/:id')
  .get(getUserHandler)
  .put(updateUserHandler)
  .delete(deleteUserHandler);

app.use('/api', router);

// index, landing page
app.get('/', (req, res)=> {
  res.send('Hello world, this is landing page');
});

let server = app.listen(3000, ()=> {
  console.log('Express is listening to http://localhost:3000');
});

Hapi-rest-apis.js

//Hapi REST APIs
const Hapi = require('hapi');
const server = new Hapi.Server(3000);

server.route([
  {
    method: 'GET',
    path: '/api/users',
    handler: (request, reply)=> {
      reply('Get all users');
    }
  },
  {
    method: 'GET',
    path: '/api/users/{id}',
    handler: (request, reply)=> {
      reply('Get user id: ' + request.params.id);
    }
  },
  {
    method: 'POST',
    path: '/api/users',
    handler: (request, reply)=> {
      reply('Post- create User');
    }
  },
  {
    method: 'PUT',
    path: '/api/users/{id}',
    handler: (request, reply)=> {
      reply('Put user id: ' + request.params.id);
    }
  },
  {
    method: 'DELETE',
    path: '/api/users/{id}',
    handler: (request, reply)=> {
      reply('Delete user id: ' + request.params.id);
    }
  },
  {
    method: 'GET',
    path: '/',
    handler: (request, reply)=> {
      reply('Hello world, this is the landing page');
    }
  }
]);

server.start(()=> {
  console.log('Hapi is listening to http://localhost:3000');
});

Koa-rest-apis.js

// Koa REST APIs
const koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();

router
  .get('/api/users', async(ctx) => {
    ctx.body = 'Get - List all users';
  })
  .get('/api/users/:id', async(ctx)=> {
    ctx.body = 'Get - get user ' + ctx.params.id;
  })
  .post('/api/users', async(ctx)=> {
    ctx.body = 'Post - create user';
  })
  .pust('/api/users/:id', async(ctx)=> {
    ctx.body = 'Put - update user ' + ctx.params.id;
  })
  .delete('/api/users/:id', async(ctx)=> {
    ctx.body = 'Delete - delete user ' + ctx.params.id;
  })

// all other routes
app.use(async()=> {
  this.body = 'Hello world, this is landing page';
});

let server = app.listen(3000, ()=> {
  console.log('Koa is listening to http://localhost:3000');
});