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];

const client = mc.createClient({
  connect: client => {
    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;
        }

      client.setSocket(socket);
      client.emit('connect');
    });
  },
  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});
  }
});