app.js

'use strict'
const express = require('express')
// create Express app
const app = express()

app.use(express.static(__dirname + '/public'));

app.get('/test', (req, res) => res.end('I\'m listening. Please access with static.'))

// listen on port
const port = process.env.PORT || 3000
app.listen(port, () => {
   console.log(`listening on ${port}`)
})