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Node.js is a server-side JavaScript framework used for developing event-driven networking programs for concurrency rather then threading.

var net = require('net');
port = 8001;

net.createServer(function (stream) {
  stream.setEncoding('utf8');

  stream.on('connect', function () {
    stream.write('hi, Your connected to my TCP Server!');
  });  

  stream.on('data', function (data) {
    stream.write('Writing network data..');
  });

  stream.on('end', function () {
    stream.write("bye bye");
    stream.end();
  });

}).listen(port, "localhost");

console.log("Server started at port "+port);

Conclusion

The example above is a basic TCP server that does nothing useful. However, by abstracting this code you can make your new TCP Server do anything you want!