You can ask for a simple example of a CRUD app, here's my code output:

const express = require('express')

const app = express()

// define the model for a user

const User = {

  name: '',

  email: ''

}

// create a new user

app.post('/users', (req, res) => {

  const user = Object.assign({}, User, req.body)


  // save the user to a database, etc.


  res.send(user)

})

// read a list of users

app.get('/users', (req, res) => {

  // retrieve a list of users from the database, etc.

  res.send([

    { name: 'Alice', email: 'alice@example.com' },

    { name: 'Bob', email: 'bob@example.com' }

  ])

})

// read a single user

app.get('/users/:id', (req, res) => {

  // retrieve a user with the specified id from the database, etc.

  res.send({ name: 'Alice', email: 'alice@example.com' })

})

// update a user

app.put('/users/:id', (req, res) => {

  // retrieve the user with the specified id from the 

database, etc. const user = Object.assign({}, User, req.body)

  // save the updated user to the database, etc.

  res.send(user)

})

// delete a user

app.delete('/users/:id', (req, res) => {

  // delete the user with the specified id from the 

database, etc.

  res.send({ message: 'User deleted' })

})

app.listen(3000, () => {

  console.log('Listening on port 3000')

})