Question

Why can’t I use port 80 in node.js? Also what are the rules of ports and ip addresses when I call the listen function in node.js. which ones are allowed and why?

var http = require('http');
http.createServer(function (req, res) {

  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Yo');

}).listen(80, "127.0.0.1");

Thanks!!!

Answer 1

Port 80 is protected, you need to be root to use it:

sudo node script.js