> ## Documentation Index
> Fetch the complete documentation index at: https://www.cometchat.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Standalone Calling

> CometChat Calling SDK v4 - Stable Release - Standalone Calling for JavaScript

## Overview

This section demonstrates how to implement calling functionality using only the CometChat Calls SDK, without requiring the Chat SDK. This is ideal for applications that need video/audio calling capabilities without the full chat infrastructure.

<Note>
  Before you begin, ensure you have completed the [Calls SDK setup](/calls/v4/javascript/setup).
</Note>

## User Authentication

To start a call session, you need a user auth token. Since this implementation doesn't use the Chat SDK, you'll need to obtain the auth token via the CometChat REST API.

<Note>
  To understand user authentication in CometChat, see the [User Auth](/fundamentals/user-auth) documentation.
</Note>

You can obtain the auth token using one of these REST API endpoints:

* [Create Auth Token](/rest-api/auth-tokens/create) — Creates a new auth token for a user
* [Get Auth Token](/rest-api/auth-tokens/get) — Retrieves an existing auth token

<Note>
  For testing or POC purposes, you can create an auth token directly from the [CometChat Dashboard](https://app.cometchat.com). Navigate to **Users & Groups → Users**, select a user, and click **+ Create Auth Token**.
</Note>

Store the auth token securely in your application for use when generating call tokens.

## Generate Call Token

A call token is required for secure access to a call session. Each token is unique to a specific session and user combination, ensuring that only authorized users can join the call.

You can generate the token just before starting the call, or generate and store it ahead of time based on your use case.

Use the `generateToken()` method to create a call token:

<Tabs>
  <Tab title="JavaScript">
    ```javascript theme={null}
    const sessionId = "UNIQUE_SESSION_ID"; // Generate a unique session ID
    const userAuthToken = "USER_AUTH_TOKEN"; // Obtained from REST API

    CometChatCalls.generateToken(sessionId, userAuthToken).then(
      (callToken) => {
        console.log("Call token generated:", callToken.token);
        // Use callToken to start the session
      },
      (error) => {
        console.log("Token generation failed:", error);
      }
    );
    ```
  </Tab>

  <Tab title="TypeScript">
    ```typescript theme={null}
    const sessionId: string = "UNIQUE_SESSION_ID"; // Generate a unique session ID
    const userAuthToken: string = "USER_AUTH_TOKEN"; // Obtained from REST API

    CometChatCalls.generateToken(sessionId, userAuthToken).then(
      (callToken: any) => {
        console.log("Call token generated:", callToken.token);
        // Use callToken to start the session
      },
      (error: any) => {
        console.log("Token generation failed:", error);
      }
    );
    ```
  </Tab>
</Tabs>

| Parameter       | Description                                                                                                         |
| --------------- | ------------------------------------------------------------------------------------------------------------------- |
| `sessionId`     | A unique session ID for the call. Generate this yourself or use a shared ID for participants to join the same call. |
| `userAuthToken` | The user auth token obtained from the CometChat REST API.                                                           |

## Start Call Session

Use the `startSession()` method to join a call session. This method requires:

1. A call token (generated in the previous step)
2. A `CallSettings` object that configures the call UI and behavior
3. An HTML element where the call UI will be rendered

<Tabs>
  <Tab title="JavaScript">
    ```javascript theme={null}
    const callListener = new CometChatCalls.OngoingCallListener({
      onUserJoined: (user) => {
        console.log("User joined:", user);
      },
      onUserLeft: (user) => {
        console.log("User left:", user);
      },
      onUserListUpdated: (userList) => {
        console.log("User list updated:", userList);
      },
      onCallEnded: () => {
        console.log("Call ended");
        CometChatCalls.endSession();
        // Close calling screen
      },
      onCallEndButtonPressed: () => {
        console.log("End call button pressed");
        CometChatCalls.endSession();
        // Close calling screen
      },
      onError: (error) => {
        console.log("Call error:", error);
      },
      onMediaDeviceListUpdated: (deviceList) => {
        console.log("Device list updated:", deviceList);
      },
      onUserMuted: (event) => {
        console.log("User muted:", event);
      },
      onScreenShareStarted: () => {
        console.log("Screen sharing started");
      },
      onScreenShareStopped: () => {
        console.log("Screen sharing stopped");
      },
      onCallSwitchedToVideo: (event) => {
        console.log("Call switched to video:", event);
      },
      onSessionTimeout: () => {
        console.log("Session timed out");
      }
    });

    const callSettings = new CometChatCalls.CallSettingsBuilder()
      .enableDefaultLayout(true)
      .setIsAudioOnlyCall(false)
      .setCallListener(callListener)
      .build();

    const htmlElement = document.getElementById("call-container");
    CometChatCalls.startSession(callToken, callSettings, htmlElement);
    ```
  </Tab>

  <Tab title="TypeScript">
    ```typescript theme={null}
    const callListener = new CometChatCalls.OngoingCallListener({
      onUserJoined: (user: any) => {
        console.log("User joined:", user);
      },
      onUserLeft: (user: any) => {
        console.log("User left:", user);
      },
      onUserListUpdated: (userList: any[]) => {
        console.log("User list updated:", userList);
      },
      onCallEnded: () => {
        console.log("Call ended");
        CometChatCalls.endSession();
        // Close calling screen
      },
      onCallEndButtonPressed: () => {
        console.log("End call button pressed");
        CometChatCalls.endSession();
        // Close calling screen
      },
      onError: (error: any) => {
        console.log("Call error:", error);
      },
      onMediaDeviceListUpdated: (deviceList: any[]) => {
        console.log("Device list updated:", deviceList);
      },
      onUserMuted: (event: any) => {
        console.log("User muted:", event);
      },
      onScreenShareStarted: () => {
        console.log("Screen sharing started");
      },
      onScreenShareStopped: () => {
        console.log("Screen sharing stopped");
      },
      onCallSwitchedToVideo: (event: any) => {
        console.log("Call switched to video:", event);
      },
      onSessionTimeout: () => {
        console.log("Session timed out");
      }
    });

    const callSettings = new CometChatCalls.CallSettingsBuilder()
      .enableDefaultLayout(true)
      .setIsAudioOnlyCall(false)
      .setCallListener(callListener)
      .build();

    const htmlElement = document.getElementById("call-container") as HTMLElement;
    CometChatCalls.startSession(callToken, callSettings, htmlElement);
    ```
  </Tab>
</Tabs>

| Parameter      | Description                                                         |
| -------------- | ------------------------------------------------------------------- |
| `callToken`    | The token received from `generateToken()` onSuccess                 |
| `callSettings` | Object of `CallSettings` class configured via `CallSettingsBuilder` |
| `htmlElement`  | DOM element where the call UI will be rendered                      |

### Call Settings

Configure the call experience using the following `CallSettingsBuilder` methods:

| Method                                                    | Description                                                                                                                                              |
| --------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `enableDefaultLayout(boolean)`                            | Enables or disables the default call UI layout with built-in controls. `true` shows the default layout. `false` hides the button layout. Default: `true` |
| `setIsAudioOnlyCall(boolean)`                             | Sets whether the call is audio-only or audio-video. `true` for audio-only, `false` for audio-video. Default: `false`                                     |
| `setCallListener(OngoingCallListener)`                    | Sets the listener to receive call events. See [Call Listeners](#call-listeners).                                                                         |
| `setMode(string)`                                         | Sets the call UI layout mode. Available: `CometChat.CALL_MODE.DEFAULT`, `CometChat.CALL_MODE.SPOTLIGHT`. Default: `DEFAULT`                              |
| `startWithAudioMuted(boolean)`                            | Starts the call with the microphone muted. Default: `false`                                                                                              |
| `startWithVideoMuted(boolean)`                            | Starts the call with the camera turned off. Default: `false`                                                                                             |
| `showEndCallButton(boolean)`                              | Shows or hides the end call button in the default layout. Default: `true`                                                                                |
| `showMuteAudioButton(boolean)`                            | Shows or hides the mute audio button. Default: `true`                                                                                                    |
| `showPauseVideoButton(boolean)`                           | Shows or hides the pause video button. Default: `true`                                                                                                   |
| `showScreenShareButton(boolean)`                          | Shows or hides the screen share button. Default: `true`                                                                                                  |
| `showModeButton(boolean)`                                 | Shows or hides the mode toggle button (switch between DEFAULT and SPOTLIGHT). Default: `true`                                                            |
| `showSwitchToVideoCallButton(boolean)`                    | Shows or hides the button to upgrade an audio call to video. Default: `true`                                                                             |
| `setMainVideoContainerSetting(MainVideoContainerSetting)` | Customizes the main video container. See [Video View Customization](/calls/v4/javascript/video-view-customisation).                                      |
| `setIdleTimeoutPeriod(number)`                            | Sets idle timeout in seconds. Warning appears 60 seconds before auto-termination. Default: `180` seconds. *v4.1.0+*                                      |

## Call Listeners

The `OngoingCallListener` provides real-time callbacks for call session events, including participant changes, call state updates, and error conditions.

You can register listeners in two ways:

1. **Via CallSettingsBuilder:** Use `.setCallListener(listener)` when building call settings
2. **Via addCallEventListener:** Use `CometChatCalls.addCallEventListener(listenerId, listener)` to add multiple listeners

Each listener requires a unique `listenerId` string. This ID is used to:

* **Prevent duplicate registrations** — Re-registering with the same ID replaces the existing listener
* **Enable targeted removal** — Remove specific listeners without affecting others

<Tabs>
  <Tab title="JavaScript">
    ```javascript theme={null}
    const listenerId = "UNIQUE_LISTENER_ID";

    CometChatCalls.addCallEventListener(listenerId, {
      onUserJoined: (user) => {
        console.log("User joined:", user);
      },
      onUserLeft: (user) => {
        console.log("User left:", user);
      },
      onUserListUpdated: (userList) => {
        console.log("User list updated:", userList);
      },
      onCallEnded: () => {
        console.log("Call ended");
        CometChatCalls.endSession();
        // Close calling screen
      },
      onCallEndButtonPressed: () => {
        console.log("End call button pressed");
        CometChatCalls.endSession();
        // Close calling screen
      },
      onError: (error) => {
        console.log("Call error:", error);
      },
      onMediaDeviceListUpdated: (deviceList) => {
        console.log("Device list updated:", deviceList);
      },
      onUserMuted: (event) => {
        console.log("User muted:", event);
      },
      onScreenShareStarted: () => {
        console.log("Screen sharing started");
      },
      onScreenShareStopped: () => {
        console.log("Screen sharing stopped");
      },
      onCallSwitchedToVideo: (event) => {
        console.log("Call switched to video:", event);
      },
      onSessionTimeout: () => {
        console.log("Session timed out");
      }
    });

    // Remove listener when done
    CometChatCalls.removeCallEventListener(listenerId);
    ```
  </Tab>

  <Tab title="TypeScript">
    ```typescript theme={null}
    const listenerId: string = "UNIQUE_LISTENER_ID";

    CometChatCalls.addCallEventListener(listenerId, {
      onUserJoined: (user: any) => {
        console.log("User joined:", user);
      },
      onUserLeft: (user: any) => {
        console.log("User left:", user);
      },
      onUserListUpdated: (userList: any[]) => {
        console.log("User list updated:", userList);
      },
      onCallEnded: () => {
        console.log("Call ended");
        CometChatCalls.endSession();
        // Close calling screen
      },
      onCallEndButtonPressed: () => {
        console.log("End call button pressed");
        CometChatCalls.endSession();
        // Close calling screen
      },
      onError: (error: any) => {
        console.log("Call error:", error);
      },
      onMediaDeviceListUpdated: (deviceList: any[]) => {
        console.log("Device list updated:", deviceList);
      },
      onUserMuted: (event: any) => {
        console.log("User muted:", event);
      },
      onScreenShareStarted: () => {
        console.log("Screen sharing started");
      },
      onScreenShareStopped: () => {
        console.log("Screen sharing stopped");
      },
      onCallSwitchedToVideo: (event: any) => {
        console.log("Call switched to video:", event);
      },
      onSessionTimeout: () => {
        console.log("Session timed out");
      }
    });

    // Remove listener when done
    CometChatCalls.removeCallEventListener(listenerId);
    ```
  </Tab>
</Tabs>

### Events

| Event                                  | Description                                                                                                                                         |
| -------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- |
| `onCallEnded()`                        | Invoked when the call session terminates for a 1:1 call. Both participants receive this callback. Only fires for calls with exactly 2 participants. |
| `onSessionTimeout()`                   | Invoked when the call is auto-terminated due to inactivity (default: 180 seconds). Warning appears 60 seconds before. *v4.1.0+*                     |
| `onCallEndButtonPressed()`             | Invoked when the local user clicks the end call button. Call `CometChatCalls.endSession()` to leave the session.                                    |
| `onUserJoined(user)`                   | Invoked when a remote participant joins. The `user` contains UID, name, and avatar.                                                                 |
| `onUserLeft(user)`                     | Invoked when a remote participant leaves the call session.                                                                                          |
| `onUserListUpdated(userList)`          | Invoked whenever the participant list changes (join or leave events).                                                                               |
| `onMediaDeviceListUpdated(deviceList)` | Invoked when available audio/video devices change (e.g., new microphone connected).                                                                 |
| `onUserMuted(event)`                   | Invoked when a participant's mute state changes. Contains `muted` and `mutedBy` properties.                                                         |
| `onScreenShareStarted()`               | Invoked when the local user starts sharing their screen.                                                                                            |
| `onScreenShareStopped()`               | Invoked when the local user stops sharing their screen.                                                                                             |
| `onCallSwitchedToVideo(event)`         | Invoked when an audio call is upgraded to a video call. Contains `sessionId`, `initiator`, and `responder`.                                         |
| `onError(error)`                       | Invoked when an error occurs during the call session.                                                                                               |

## End Call Session

To end the call session and release all media resources (camera, microphone, network connections), call `CometChatCalls.endSession()` in the `onCallEndButtonPressed()` callback.

<Tabs>
  <Tab title="JavaScript">
    ```javascript theme={null}
    onCallEndButtonPressed: () => {
      CometChatCalls.endSession();
      // Close the calling screen
    }
    ```
  </Tab>

  <Tab title="TypeScript">
    ```typescript theme={null}
    onCallEndButtonPressed: () => {
      CometChatCalls.endSession();
      // Close the calling screen
    }
    ```
  </Tab>
</Tabs>

## Methods

These methods are available for performing custom actions during an active call session. Use them to build custom UI controls or implement specific behaviors based on your use case.

<Note>
  These methods can only be called when a call session is active.
</Note>

### Switch Camera

Toggles between the front and rear camera during a video call. Only supported on mobile browsers.

```javascript theme={null}
CometChatCalls.switchCamera();
```

<Note>
  This method is only supported on mobile browsers. It has no effect on desktop browsers. *Available since v4.2.0*
</Note>

### Mute Audio

Controls the local audio stream transmission. `true` mutes, `false` unmutes.

```javascript theme={null}
CometChatCalls.muteAudio(true);
```

### Pause Video

Controls the local video stream transmission. `true` pauses, `false` resumes.

```javascript theme={null}
CometChatCalls.pauseVideo(true);
```

### Start Screen Share

```javascript theme={null}
CometChatCalls.startScreenShare();
```

### Stop Screen Share

```javascript theme={null}
CometChatCalls.stopScreenShare();
```

### Set Mode

Changes the call UI layout mode dynamically during the call.

```javascript theme={null}
CometChatCalls.setMode(CometChat.CALL_MODE.SPOTLIGHT);
```

### Get Audio Input Devices

```javascript theme={null}
const audioInputDevices = CometChatCalls.getAudioInputDevices();
```

### Get Audio Output Devices

```javascript theme={null}
const audioOutputDevices = CometChatCalls.getAudioOutputDevices();
```

### Get Video Input Devices

```javascript theme={null}
const videoInputDevices = CometChatCalls.getVideoInputDevices();
```

### Set Audio Input Device

```javascript theme={null}
CometChatCalls.setAudioInputDevice(deviceId);
```

### Set Audio Output Device

```javascript theme={null}
CometChatCalls.setAudioOutputDevice(deviceId);
```

### Set Video Input Device

```javascript theme={null}
CometChatCalls.setVideoInputDevice(deviceId);
```

### Switch To Video Call

```javascript theme={null}
CometChatCalls.switchToVideoCall();
```

### End Call

```javascript theme={null}
CometChatCalls.endSession();
```