Express Hello World (quick start)

index.js

/* index.js
 * Express Hello World
 * first:
 * npm i express
 * node index.js
 */

const express = require('express');
const app = express();                                                                                                   
                                                                                                                       
app.get('/', function(req,res) {                                                                                       
   res.send("Hello, World!");                                                                                            
});                                                                                                                    
                                                                                                                       
app.listen(8000);
console.log("Please visit http://localhost:8000");