---
title: Select Known Packs (serverbound)
description: "Configuration 0x07, client → server."
---

`config` · `0x07` · **serverbound** (client → server)

Answer to the clientbound `SelectKnownPacks`. The client lists the data packs (namespace, id, version) it already has locally. For each matching pack, the server can omit the registry entries in `RegistryData` and send only their ids.

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

## Fields

| Field | Type | Notes |
|---|---|---|
| `packs` | Array | also `knownPacks` |

## Send it

```ts
// Client side, choose packs offered by the server.
client.on("SelectKnownPacks", async (data) => {
  await client.sendPacket("SelectKnownPacks", {
    packs: data.knownPacks.filter((pack) =>
      pack.namespace === "minecraft" && pack.id === "core"
    ),
  });
});
```

Return only packs the client really has, preserving each offered `namespace`, `id`, and `version`. Send an empty array if none are known; `knownPacks` is accepted as an alias for `packs`.

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

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