node-minecraft-protocol/examples/server_helloworld/server_helloworld.js

var mc = require('../');

var options = {
  'online-mode': true,
};

var server = mc.createServer(options);

server.on('login', function(client) {
  var addr = client.socket.remoteAddress;
  console.log('Incoming connection', '('+addr+')');

  client.on('end', function() {
    console.log('Connection closed', '('+addr+')');
  });

  // send init data so client will start rendering world
  client.write('login', {
    entityId: client.id,
    levelType: 'default',
    gameMode: 0,
    dimension: 0,
    difficulty: 2,
    maxPlayers: server.maxPlayers,
    reducedDebugInfo: false
  });

  client.write('position', {
    x: 0,
    y: 1.62,
    z: 0,
    yaw: 0,
    pitch: 0,
    flags: 0x00
  });

  var msg = {
    translate: 'chat.type.announcement',
    "with": [
      'Server',
      'Hello, world!'
    ]
  };
  client.write('chat', { message: JSON.stringify(msg), position: 0 });
});

server.on('error', function(error) {
  console.log('Error:', error);
});

server.on('listening', function() {
  console.log('Server listening on port', server.socketServer.address().port);
});