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

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

if(process.argv.length < 6 || process.argv.length > 8) {
  console.log("Usage : node client_socks_proxy.js <host> <port> <proxyHost> <proxyPort> [<name>] [<password>]");
  process.exit(1);
}

const proxyHost=process.argv[4];
const proxyPort=process.argv[5];

socks.createConnection({
  proxy: {
    ipaddress: proxyHost,
    port: proxyPort,
    type: 5
  },
  target: {
    host: process.argv[2],
    port: parseInt(process.argv[3])
  },
}, function(err, socket) {
  if (err) {
    console.log(err);
    return;
  }
  const client = mc.createClient({
    stream: socket,
    username: process.argv[6] ? process.argv[6] : "echo",
    password: process.argv[7]
  });

  client.on('connect', function() {
    console.info('connected');
  });
  client.on('disconnect', function(packet) {
    console.log('disconnected: '+ packet.reason);
  });
  client.on('end', function(err) {
    console.log('Connection lost');
  });
  client.on('chat', function(packet) {
    const jsonMsg = JSON.parse(packet.message);
    if(jsonMsg.translate === 'chat.type.announcement' || jsonMsg.translate === 'chat.type.text') {
      const username = jsonMsg.with[0].text;
      const msg = jsonMsg.with[1];
      if(username === client.username) return;
      client.write('chat', {message: msg});
    }
  });
});