---
title: Open Screen
description: "Play 0x3B, server → client."
---

`play` · `0x3B` · **clientbound** (server → client)

Opens a container screen on the client with window id `windowId`, screen type `inventoryType`, and a `windowTitle` text component. The server sends it when the player opens a chest, furnace, crafting table, or other container. The client shows the screen; the horse inventory uses HorseScreenOpen instead.

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

## Fields

| Field | Type | Notes |
|---|---|---|
| `windowId` | VarInt |  |
| `inventoryType` | VarInt |  |
| `windowTitle` | NBT |  |

## Send it

```ts
await client.sendPacket("OpenScreen", {
  windowId: 1, // nonzero; 0 is the player inventory
  inventoryType: 2, // generic_9x3: a double chest is 5 (generic_9x6)
  windowTitle: { text: "Loot" },
});
await client.sendPacket("ContainerSetContent", {
  windowId: 1,
  stateId: 1,
  slotData: Array(27 + 36).fill(helpers.emptySlot()),
  carriedItem: helpers.emptySlot(),
});
```

`inventoryType` is the menu registry ID: `0` to `5` are `generic_9x1` to `generic_9x6`, `6` is `generic_3x3`, `7` `crafter_3x3`, `8` `anvil`, `9` `beacon`, `10` `blast_furnace`, `11` `brewing_stand`, `12` `crafting`, `13` `enchantment`, `14` `furnace`, `15` `grindstone`, `16` `hopper`, `17` `lectern`, `18` `loom`, `19` `merchant`, `20` `shulker_box`, `21` `smithing`, `22` `smoker`, `23` `cartography_table`, `24` `stonecutter`. Fill it with `ContainerSetContent`; the client sends `ContainerClose` when the player closes it.

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

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