Custom Query

login · 0x04 · clientbound (server → client)

Login plugin request. The server sends a messageId, a namespaced channel, and raw data to negotiate with modded clients or proxies before login completes. The client must respond with CustomQueryAnswer using the same messageId.

Sent by the server, read by the client. Listen for it with client.on("CustomQuery", (data) => …) on the receiving side.

Fields

Field	Type	Notes
`messageId`	VarInt
`channel`	String
`data`	Byte[]

Send it

await client.sendPacket("CustomQuery", {
  messageId: /* VarInt */,
  channel: /* String */,
  data: /* Byte[] */,
});

Field aliases listed under Notes are accepted as alternative keys when writing.

Source: src/Core/Versions/776/Packets/login/clientbound/CustomQuery.ts