app.js

 const express = require("express");
 const app = express();

 app.use(express.static('public'));

 app.get("/", function(req, res) {
    res.sendFile( __dirname + '/index.html');
 });


 const port = 3001;
 app.listen(port, function() {
   console.log("Listening on " + port);
 });