Our last Hello, World example

Now create a file lasthello.js in the project folder. For convenience, we added the relevant code to the previous Express example. Everything that worked before still works but if you type http://localhost:3000/, you will see a page with the layout from the layout file and {{{body}}} replaced by(you guessed it):

var express = require('express');
var path = require('path');
var app = express();
var handlebars = require('express-handlebars') .create({ defaultLayout:'main' });
    app.engine('handlebars', handlebars.engine);
    app.set('view engine', 'handlebars');
app.set('port', process.env.PORT || 3000);

var options = {
  dotfiles: 'ignore',
  etag: false,
  extensions: ['htm', 'html'],
  index: false
};

app.use(express.static(path.join(__dirname, 'public') , options    ));
app.get('/', function(req, res)
{
res.render('hello...