Create Express application

index.js

const express = require('express')

// instantiate express application
const app = express()

// create simple route
app.get('/', (req, res) => {
  res.send('Hello world!')
})

// start application
const PORT = 8080
app.listen(PORT, () => {
  console.log(`Listening on port ${PORT}`)
})

package.json

{
  "name": "express-example",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.1"
  }
}