$ npm i express

const express = require('express')
const app = express()
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(3000, () => console.log('Example app listening on port 3000)));}!'))

const express = require('express')
const app = express()
// GET
app.get('/', function (req, res) {
 res.send('Hello World!')
})
// POST
app.post('/', function (req, res) {
 res.send('Got a POST request')
})
// PUT
app.put('/user', function (req, res) {
 res.send('Got a PUT request at /user')
})
// DELETE
app.delete('/user', function (req, res) {
 res.send('Got a DELETE request at /user')
})