---
title: Keep Alive (clientbound)
description: "Configuration 0x04, server → client."
---

`config` · `0x04` · **clientbound** (server → client)

Keep-alive during configuration. The server sends a random `keepAliveId` and the client must echo it back in its own `KeepAlive` within the timeout, or it is disconnected.

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

## Fields

| Field | Type | Notes |
|---|---|---|
| `keepAliveId` | Long | also `id` |

## Send it

```ts
// Server side, while the connection remains in configuration.
const keepAliveId = BigInt(Date.now());
await client.sendPacket("KeepAlive", { keepAliveId });
```

Keep the ID until the client returns a serverbound `KeepAlive` with the same value. `keepAliveId` is signed 64-bit; `id` is accepted as an alias.

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

Source: [`src/Core/Versions/776/Packets/config/clientbound/KeepAlive.ts`](https://github.com/GDLev/mc-protocol/blob/master/src/Core/Versions/776/Packets/config/clientbound/KeepAlive.ts)