Hello (serverbound)

login · 0x00 · serverbound (client → server)

Login start. Sent by the client immediately after switching to the login state, with the player’s username and profile playerUUID. The server then either starts encryption with Hello (clientbound), or in offline mode goes straight to compression and LoginFinished.

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

Fields

Field	Type	Notes
`username`	String	also `name`
`playerUUID`	UUID	also `uuid`

Send it

await client.sendPacket("Hello", {
  username: "bot",
  playerUUID: "00000000000000000000000000000000", // 32 hex chars, no dashes
});

Send right after Intension with nextState: 2. An mc-protocol server with autoInit answers with LoginCompression and LoginFinished and records the name and UUID on client.session.

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

Source: src/Core/Versions/776/Packets/login/serverbound/Hello.ts