Child process argv

child.js

const http = require('http');

const server = http.createServer((req, res) => {
  res.end();
});
server.on('clientError', (err, socket) => {
  socket.end('HTTP/1.1 400 Bad Request\r\n\r\n');
});

server.listen(process.argv[2]);

index.js

var fork = require('child_process').fork;
var child = fork(__dirname + '/child.js', ['8000']);
var childToo = fork(__dirname + '/child.js', ['8080']);