---
title: Container Set Content
description: "Play 0x12, server → client."
---

`play` · `0x12` · **clientbound** (server → client)

Replaces all slot contents of the window `windowId` with `items`, plus the item held on the cursor (`carriedItem`). Window 0 is the player inventory. The server sends it when a window opens or when the full contents need to be resynced. The client applies the slots and uses `stateId` to detect stale updates.

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

## Fields

| Field | Type | Notes |
|---|---|---|
| `windowId` | ContainerID |  |
| `stateId` | VarInt |  |
| `items` | Array | also `slotData` |
| `carriedItem` | [Slot](/docs/items) |  |

## Send it

```ts
await client.sendPacket("ContainerSetContent", {
  windowId: /* ContainerID */,
  stateId: /* VarInt */,
  items: /* Array */,
  carriedItem: /* Slot */,
});
```

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

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