Question

here is the code you can find every where on net

var net = require('net');

var server = net.createServer(function (socket) {
  socket.write("Echo server\r\n");
  socket.pipe(socket);
});

server.listen(1337, "127.0.0.1");

A simple tcp server will echo whatever you will send it. How to send data to it? What tools/commands I need in mac to test this server?

Answer 1

Use nc aka netcat. In Terminal.app, while your node app is running:

$ nc localhost 1337
Echo server

Ta-da!