***

id: f421ed50-2ac0-4a23-8a6f-14af00c33855
title: lock
slug: /node/reference/video/room-session/lock
description: lock method for the RoomSession class.
max-toc-depth: 3
----------------

[roomsession-41]: /docs/server-sdk/v4/node/reference/video/room-session

### lock

* **lock**(`params`): `Promise<void>`

Locks the room. This prevents new participants from joining the room.

#### Returns

`Promise<void>`

#### Example

In this example, we wait for a room to start and then lock the room. This prevents
new participants from joining the room. This example assumes that there is a [`RoomSession`][roomsession-41]
already active and that members are joining the room.

```js
import { SignalWire } from "@signalwire/realtime-api";

const client = await SignalWire({ project: "ProjectID Here", token: "Token Here" })

const videoClient = client.video;

// Setup listener for when a room starts
await videoClient.listen({
  onRoomStarted: async (roomsession) => {
      // Lock the room
      console.log('Locking room');
      await roomsession.lock();
  }
})
```