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

const mc = require('minecraft-protocol');

if(process.argv.length < 4 || process.argv.length > 6) {
  console.log("Usage : node client_channel.js <host> <port> [<name>] [<password>]");
  process.exit(1);
}

const client = mc.createClient({
  host: process.argv[2],
  port: parseInt(process.argv[3]),
  username: process.argv[4] ? process.argv[4] : "test",
  password: process.argv[5],
  version: '1.10'
});


client.on('login', onlogin);
client.on('error', console.log);

function onlogin() {
  client.registerChannel('CUSTOM|ChannelOne',['i32',[]],true);
  client.registerChannel('CUSTOM|ChannelTwo',['i32',[]],true);
  client.writeChannel('CUSTOM|ChannelOne', 4);
  client.on('CUSTOM|ChannelTwo',console.log);
}