node.js install and hello world

curl -sL https://deb.nodesource.com/setup | sudo bash -

sudo apt-get install -y nodejs

apt-get install -y build-essential

example.js

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');

result

% node example.js
Server running at http://127.0.0.1:1337/