Simplest Node.js Web Server

server.js

const http = require('http')
const PORT = 3000

const requestHandler = (request, response) => {
  response.end('Hello World!')
}

const server = http.createServer(requestHandler)

server.listen(PORT, (err) => {
  if (err) {
    return console.log('something bad happened', err)
  }

  console.log(`server is listening on ${PORT}`)
})