pm2/examples/process-file/http.js

var http = require('http');

var server = http.createServer(function(req, res) {
  res.writeHead(200);
  res.end('hey');
}).listen(process.env.PORT || 8000, function() {
  console.log('App listening on port %d in env %s', process.env.PORT || 8000, process.env.NODE_ENV);
});