minecraft protocol

Parse and serialize minecraft packets, plus authentication and encryption.

Features

• Supports Minecraft PC version 1.7.10, 1.8.8, 1.9 (15w40b, 1.9, 1.9.1-pre2, 1.9.2, 1.9.4), 1.10 (16w20a, 1.10-pre1, 1.10, 1.10.1, 1.10.2), 1.11 (16w35a, 1.11, 1.11.2), 1.12 (17w15a, 17w18b, 1.12-pre4, 1.12, 1.12.1, 1.12.2), and 1.13 (17w50a, 1.13, 1.13.1, 1.13.2-pre1, 1.13.2-pre2, 1.13.2), 1.14 (1.14, 1.14.1, 1.14.3, 1.14.4) , 1.15 (1.15, 1.15.1, 1.15.2) and 1.16 (20w13b, 20w14a, 1.16-rc1, 1.16, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5), 1.17 (21w07a, 1.17, 1.17.1), 1.18 (1.18, 1.18.1 and 1.18.2), 1.19 (1.19, 1.19.1, 1.19.2, 1.19.3, 1.19.4), 1.20 (1.20, 1.20.1, 1.20.2, 1.20.3 and 1.20.4)
• Parses all packets and emits events with packet fields as JavaScript objects.
• Send a packet by supplying fields as a JavaScript object.
• Client
  • Authenticating and logging in
  • Encryption
  • Compression
  • Both online and offline mode
  • Respond to keep-alive packets.
  • Ping a server for status
• Server
  • Online/Offline mode
  • Encryption
  • Compression
  • Handshake
  • Keep-alive checking
  • Ping status
• Robust test coverage.
• Optimized for rapidly staying up to date with Minecraft protocol updates.

Want to contribute on something important for PrismarineJS ? go to https://github.com/PrismarineJS/mineflayer/wiki/Big-Prismarine-projects

Third Party Plugins

node-minecraft-protocol is pluggable.

• minecraft-protocol-forge add forge support to minecraft-protocol

Projects Using node-minecraft-protocol

• mineflayer - Create minecraft bots with a stable, high level API.
• mcserve - Runs and monitors your minecraft server, provides real-time web interface, allow your users to create bots.
• flying-squid - Create minecraft servers with a high level API, also a minecraft server by itself.
• pakkit - A GUI tool to monitor Minecraft packets in real time, allowing you to view their data and interactively edit and resend them.
• minecraft-packet-debugger - A tool to capture Minecraft packets in a buffer then view them in a browser.
• aresrpg - An open-source mmorpg minecraft server.
• SteveProxy - Proxy for Minecraft with the ability to change the gameplay using plugins.
• and several thousands others

Installation

npm install minecraft-protocol

Documentation

• API doc
• faq
• protocol doc and wiki.vg/Protocol

Usage

Echo client example

const mc = require('minecraft-protocol');
const client = mc.createClient({
  host: "localhost",   // optional
  port: 25565,         // optional
  username: "[email protected]",
  password: "12345678",
  auth: 'microsoft' // optional; by default uses offline mode, if using a microsoft account, set to 'microsoft'
});

client.on('chat', function(packet) {
  // Listen for chat messages and echo them back.
  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.text});
  }
});

If the server is in offline mode, you may leave out the password option and switch auth to offline. You can also leave out password when using a Microsoft account. If provided, password based auth will be attempted first which may fail. Note: if using a Microsoft account, your account age must be >= 18 years old.

Client example joining a Realm

Example to connect to a Realm that the authenticating account is owner of or has been invited to:

const mc = require('minecraft-protocol');
const client = mc.createClient({
  realms: {
    pickRealm: (realms) => realms[0] // Function which recieves an array of joined/owned Realms and must return a single Realm. Can be async
  },
  auth: 'microsoft'
})

Hello World server example

For a more up to date example, see examples/server/server.js.

const mc = require('minecraft-protocol')
const nbt = require('prismarine-nbt')
const server = mc.createServer({
  'online-mode': true,   // optional
  encryption: true,      // optional
  host: '0.0.0.0',       // optional
  port: 25565,           // optional
  version: '1.20.4'
})
const mcData = require('minecraft-data')(server.version)

function chatText (text) {
  return mcData.supportFeature('chatPacketsUseNbtComponents')
    ? nbt.comp({ text: nbt.string(text) })
    : JSON.stringify({ text })
}

server.on('playerJoin', function(client) {
  const loginPacket = mcData.loginPacket

  client.write('login', {
    ...loginPacket,
    entityId: client.id,
    hashedSeed: [0, 0],
    maxPlayers: server.maxPlayers,
    viewDistance: 10,
    reducedDebugInfo: false,
    enableRespawnScreen: true,
    isDebug: false,
    isFlat: false
  })

  client.write('position', {
    x: 0,
    y: 255,
    z: 0,
    yaw: 0,
    pitch: 0,
    flags: 0x00
  })

  const message = {
    translate: 'chat.type.announcement',
    with: [
      'Server',
      'Hello, world!'
    ]
  }
  if (mcData.supportFeature('signedChat')) {
    client.write('player_chat', {
      plainMessage: message,
      signedChatContent: '',
      unsignedChatContent: chatText(message),
      type: 0,
      senderUuid: 'd3527a0b-bc03-45d5-a878-2aafdd8c8a43', // random
      senderName: JSON.stringify({ text: 'me' }),
      senderTeam: undefined,
      timestamp: Date.now(),
      salt: 0n,
      signature: mcData.supportFeature('useChatSessions') ? undefined : Buffer.alloc(0),
      previousMessages: [],
      filterType: 0,
      networkName: JSON.stringify({ text: 'me' })
    })
  } else {
    client.write('chat', { message: JSON.stringify({ text: message }), position: 0, sender: 'me' })
  }
})

Testing

• Ensure your system has the java executable in PATH.
• MC_SERVER_JAR_DIR=some/path/to/store/minecraft/server/ [email protected] MC_PASSWORD=password npm test

Debugging

You can enable some protocol debugging output using DEBUG environment variable:

DEBUG="minecraft-protocol" node [...]

On Windows:

set DEBUG=minecraft-protocol
node your_script.js

Contribute

Please read https://github.com/PrismarineJS/prismarine-contribute

History

See history

Related

• node-rcon can be used to access the rcon server in the minecraft server
• map-colors can be used to convert any image into a buffer of minecraft compatible colors