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Documentation

mc.createServer(options)

Returns a Server instance and starts listening. All clients will be automatically logged in and validated against mojang's auth.

options is an object containing the properties :

  • port : default to 25565
  • host : default to undefined which means listen to all available ipv4 and ipv6 adresses (see https://nodejs.org/api/net.html#net_server_listen_port_host_backlog_callback for details)
  • kickTimeout : default to 10*1000 (10s), kick client that doesn't answer to keepalive after that time
  • checkTimeoutInterval : default to 4*1000 (4s), send keepalive packet at that period
  • online-mode : default to true
  • beforePing : allow customisation of the answer to ping the server does. It takes a function with argument response and client, response is the default json response, and client is client who sent a ping. It can take as third argument a callback. If the callback is passed, the function should pass its result to the callback, if not it should return. If the result is false instead of a response object then the connection is terminated and no ping is returned to the client.
  • beforeLogin : allow customisation of client before the success packet is sent. It takes a function with argument client and should be synchronous for the server to wait for completion before continuing execution.
  • motd : default to "A Minecraft server"
  • motdMsg : A json object of the chat message to use instead of motd. Can be build using prismarine-chat and calling .toJSON(). Not used with legacy pings.
  • maxPlayers : default to 20
  • keepAlive : send keep alive packets : default to true
  • version : the version of the server, defaults to the latest version. Set version to false to enable dynamic cross version support.
  • fallbackVersion (optional) : the version that should be used as a fallback, if the client version isn't supported, only works with dynamic cross version support.
  • favicon (optional) : the favicon to set, base64 encoded
  • customPackets (optional) : an object index by version/state/direction/name, see client_custom_packet for an example
  • errorHandler : A way to override the default error handler for client errors. A function that takes a Client and an error. The default kicks the client.
  • hideErrors : do not display errors, default to false
  • agent : a http agent that can be used to set proxy settings for yggdrasil authentication confirmation (see proxy-agent on npm)
  • validateChannelProtocol (optional) : whether or not to enable protocol validation for custom protocols using plugin channels for the connected clients. Defaults to true
  • enforceSecureProfile (optional) : Kick clients that do not have chat signing keys from Mojang (1.19+)
  • generatePreview (optional) : Function to generate chat previews. Takes the raw message string and should return the message preview as a string. (1.19-1.19.2)
  • socketType (optional) : either tcp or ipc. Switches from a tcp connection to a ipc socket connection (or named pipes on windows). With the ipc option host becomes the path off the ipc connection on the local filesystem. Example: \\.\pipe\minecraft-ipc (Windows) /tmp/minecraft-ipc.sock (unix based systems). See the ipcConnection example for an example.
  • Server : You can pass a custom server class to use instead of the default one.

mc.Server(version,[customPackets])

Create a server instance for version of minecraft.

server.writeToClients(clients, name, params)

Write a packet to all clients but encode it only once.

client.verifyMessage(packet) : boolean

(1.19-1.19.2) Verifies if player's chat message packet was signed with their Mojang provided key. Handled internally (and thus deprecated) in 1.19.3 and above

client.logSentMessageFromPeer(packet)

(1.19.1+) You must call this function when the server receives a message from a player and that message gets broadcast to other players in player_chat packets. This function stores these packets so the server can then verify a player's lastSeenMessages field in inbound chat packets to ensure chain integrity. For more information, see chat.md.

server.onlineModeExceptions

This is a plain old JavaScript object. Add a key with the username you want to be exempt from online mode or offline mode (whatever mode the server is in).

Make sure the entries in this object are all lower case.

server.clients

Javascript object mapping a Client from a clientId.

server.playerCount

The amount of players currently present on the server.

server.maxPlayers

The maximum amount of players allowed on the server.

server.motd

The motd that is sent to the player when he is pinging the server

server.favicon

A base64 data string representing the favicon that will appear next to the server on the mojang client's multiplayer list.

connection event

Called when a client connects, but before any login has happened. Takes a Client parameter.

login event

Called when a client is logged in against server. Takes a Client parameter.

playerJoin event

Emitted after a player joins and enters the PLAY protocol state and can send and recieve game packets. This is emitted after the login event. On 1.20.2 and above after we emit the login event, the player will enter a CONFIG state, as opposed to the PLAY state (where game packets can be sent), so you must instead now wait for playerJoin.

listening event

Called when the server is listening for connections. This means that the server is ready to accept incoming connections.

close event

Called when the server is no longer listening to incoming connections.

mc.createClient(options)

Returns a Client instance and perform login.

options is an object containing the properties :

  • username
  • port : default to 25565
  • auth : the type of account to use, either microsoft, mojang, offline or function (client, options) => void. defaults to 'offline'.
  • password : can be omitted
    • (microsoft account) leave this blank to use device code auth. If you provide a password, we try to do username and password auth, but this does not always work.
    • (mojang account) If provided, we auth with the username and password. If this is blank, and profilesFolder is specified, we auth with the tokens there instead. If neither password or profilesFolder are specified, we connect in offline mode.
  • host : default to localhost
  • session : An object holding clientToken, accessToken and selectedProfile. Generated after logging in using username + password with mojang auth or after logging in using microsoft auth. clientToken, accessToken and selectedProfile: {name: '<username>', id: '<selected profile uuid>'} can be set inside of session when using createClient to login with a client and access Token instead of a password. session is also emitted by the Client instance with the event 'session' after successful authentication.
    • clientToken : generated if a password is given or can be set when when using createClient
    • accessToken : generated if a password or microsoft account is given or can be set when using createBot
    • selectedProfile : generated if a password or microsoft account is given. Can be set as a object with property name and id that specifies the selected profile.
      • name : The selected profiles in game name needed for logging in with access and client Tokens.
      • id : The selected profiles uuid in short form (without -) needed for logging in with access and client Tokens.
  • authServer : auth server, default to https://authserver.mojang.com
  • sessionServer : session server, default to https://sessionserver.mojang.com
  • keepAlive : send keep alive packets : default to true
  • closeTimeout : end the connection after this delay in milliseconds if server doesn't answer to ping, default to 120*1000
  • noPongTimeout : after the server opened the connection, wait for a default of 5*1000 after pinging and answers without the latency
  • checkTimeoutInterval : default to 30*1000 (30s), check if keepalive received at that period, disconnect otherwise.
  • version : 1.8 or 1.9 or false (to auto-negotiate): default to 1.8
  • customPackets (optional) : an object index by version/state/direction/name, see client_custom_packet for an example
  • hideErrors : do not display errors, default to false
  • skipValidation : do not try to validate given session, defaults to false
  • stream : a stream to use as connection
  • connect : a function taking the client as parameter and that should client.setSocket(socket) and client.emit('connect') when appropriate (see the proxy examples for an example of use)
  • agent : a http agent that can be used to set proxy settings for yggdrasil authentication (see proxy-agent on npm)
  • fakeHost : (optional) hostname to send to the server in the set_protocol packet
  • profilesFolder : optional
    • (mojang account) the path to the folder that contains your launcher_profiles.json. defaults to your minecraft folder if it exists, otherwise the local directory. set to false to disable managing profiles
    • (microsoft account) the path to store authentication caches, defaults to .minecraft
  • onMsaCode(data) : (optional) callback called when signing in with a microsoft account with device code auth. data is an object documented here
  • id : a numeric client id used for referring to multiple clients in a server
  • validateChannelProtocol (optional) : whether or not to enable protocol validation for custom protocols using plugin channels. Defaults to true
  • disableChatSigning (optional) : Don't try obtaining chat signing keys from Mojang (1.19+)
  • realms : An object which should contain one of the following properties: realmId or pickRealm. When defined will attempt to join a Realm without needing to specify host/port. The authenticated account must either own the Realm or have been invited to it
    • realmId : The id of the Realm to join.
    • pickRealm(realms) : A function which will have an array of the user Realms (joined/owned) passed to it. The function should return a Realm.
  • Client : You can pass a custom client class to use instead of the default one, which would allow you to create completely custom communication. Also note that you can use the stream option instead where you can supply custom duplex, but this will still use serialization/deserialization of packets.

mc.Client(isServer,version,[customPackets])

Create a new client, if isServer is true then it is a server-side client, otherwise it's a client-side client. Takes a minecraft version as second argument.

client.write(name, params)

write a packet

client.writeRaw(buffer)

write a raw buffer as a packet

client.end(reason, fullReason)

Ends the connection with reason or fullReason If fullReason is not defined, then the reason will be used.

fullReason is a JSON object, which represents chat message.

client.connect(port, host)

Used by the Client Class to connect to a server, done by createClient automatically

client.setSocket(socket)

Sets the client's connection socket.

client.registerChannel(name, typeDefinition, custom)

Registers a plugin channel with the given name and protodef typeDefinition

client.unregisterChannel(name)

Unregisters a plugin channel.

client.writeChannel(channel, params)

Write to Plugin Channels

client.state

The internal state that is used to figure out which protocol state we are in during packet parsing. This is one of the protocol.states.

client.isServer

True if this is a connection going from the server to the client, False if it is a connection from client to server.

client.socket

Returns the internal nodejs Socket used to communicate with this client.

client.uuid

A string representation of the client's UUID. Note that UUIDs are unique for each players, while playerNames, as of 1.7.7, are not unique and can change.

client.username

The user's username.

client.session

The user's session, as returned by the Yggdrasil system. (only client-side)

client.profile

The player's profile, as returned by the Yggdrasil system. (only server-side)

client.latency

The latency of the client, in ms. Updated at each keep alive.

client.customPackets

An object index by version/state/direction/name, see client_custom_packet for an example

client.protocolVersion

The client's protocol version

client.version

The client's version, as a string

packet event

Called with every packet parsed. Takes four paramaters, the JSON data we parsed, the packet metadata (name, state), the buffer (raw data) and the full buffer (includes surplus data and may include the data of following packets on versions below 1.8)

raw event

Called with every packet, but as a buffer. Takes two params, the buffer and the packet metadata (name, state)

connect event

when the socket connects to the server, this is emitted

end event

Called when the client's connection is disconnected. Takes the reason as parameter

session event

Called when user authentication is resolved. Takes session data as parameter.

state event

Called when the protocol changes state. Takes the new state and old state as parameters.

playerJoin event

Emitted after the player enters the PLAY protocol state and can send and recieve game packets

error event

Called when an error occurs within the client. Takes an Error as parameter.

playerChat event

Called when a chat message from another player arrives. The emitted object contains:

  • formattedMessage -- (JSON) the chat message preformatted, if done on server side
  • plainMessage -- (Plaintext) the chat message without formatting (for example no <username> message ; instead message), on version 1.19+
  • unsignedContent -- (JSON) unsigned formatted chat contents ; should only be present when the message is modified and server has chat previews disabled - only on version 1.19 - 1.19.2
  • type -- the message type - on 1.19, which format string to use to render message ; below, the place where the message is displayed (for example chat or action bar)
  • sender -- the UUID of the player sending the message
  • senderTeam -- scoreboard team of the player (pre 1.19)
  • senderName -- Name of the sender
  • targetName -- Name of the target (for outgoing commands like /tell). Only in 1.19.2+
  • verified -- true if message is signed, false if not signed, undefined on versions prior to 1.19

systemChat event

Called when a system chat message arrives. A system chat message is any message not sent by a player. The emitted object contains:

  • formattedMessage -- (JSON) the chat message preformatted
  • positionId -- the chat type of the message. 1 for system chat and 2 for actionbar

See the chat example for usage.

per-packet events

Check out the minecraft-data docs to know the event names and data field names.

client.writeChannel(channel, params)

write a packet to a plugin channel

client.registerChannel(name, typeDefinition, [custom])

Register a channel name using the protodef typeDefinition and sending the register packet if custom is true.

Start emitting channel events of the given name on the client object.

client.unregisterChannel(name, [custom])

Unregister a channel name and send the unregister packet if custom is true.

client.chat(message)

Send a chat message to the server, with signing on 1.19+.

client.signMessage(message: string, timestamp: BigInt, salt?: number, preview?: string, acknowledgements?: Buffer[]) : Buffer

(1.19) Generate a signature for a chat message to be sent to server

client.verifyMessage(publicKey: Buffer | KeyObject, packet) : boolean

(1.19) Verifies a player chat packet sent by another player against their public key

Not Immediately Obvious Data Type Formats

Note : almost all data formats can be understood by looking at minecraft-data docs or minecraft-data protocol.json

entityMetadata

Value looks like this:

[
  {type: 1, value: 2, key: 3},
  {type: 2, value: 3, key: 4},
  ...
]

Where the key is the numeric metadata key and the value is the value of the correct data type. You can figure out the types here

mc.ping(options, callback)

options is an object containing the following:

  • host : default to localhost
  • port : default to 25565
  • version: default to most recent version

Ping a minecraft server and return a promise or use an optional callback containing the information about it

returns: promise( <pending> ).then(pingResult).catch(err) callback callback(err, pingResults)

pingResults:

Old version

  • prefix
  • protocol
  • version
  • motd
  • playerCount
  • maxPlayers

New version

  • description
  • players
    • max
    • online
    • sample
      • id
      • name
  • version
    • name
    • protocol
  • favicon
  • latency

mc.states

The minecraft protocol states.

mc.supportedVersions

The supported minecraft versions.

mc.defaultVersion

The current default minecraft version.

mc.createSerializer({ state = states.HANDSHAKING, isServer = false , version})

Returns a minecraft protocol serializer for these parameters.

mc.createDeserializer({ state = states.HANDSHAKING, isServer = false, packetsToParse = {"packet": true}, version })

Returns a minecraft protocol deserializer for these parameters.