> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-platform-docs-release.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Collaboration

> Extensions that enable real-time collaboration in your chat application

These extensions enable real-time collaboration directly within your chat. Users can work together on documents and whiteboards without leaving the conversation.

## Collaborative document

Co-edit documents in real-time with other users. Perfect for meeting notes, collaborative writing, and shared planning.

**When to use:** Meeting notes, collaborative drafting, shared to-do lists, or any scenario where multiple people need to edit text together.

<Note>
  **Out-of-the-box in:** [UI Kit Builder](/chat-builder/react/features) ✅ | [Widget Builder](/widget/html/features) ✅ | [UI Kits](/ui-kit/react/extensions#collaborative-document) ✅ | [SDK](/sdk/javascript/overview) ✅
</Note>

<Frame>
  <img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/Be6Mu14MqhiP8v4-/images/extensions-collaborative-document.png?fit=max&auto=format&n=Be6Mu14MqhiP8v4-&q=85&s=bec55c385b70d4392613ec0912f28396" width="1280" height="712" data-path="images/extensions-collaborative-document.png" />
</Frame>

### Extension settings

<Steps>
  <Step title="Open your CometChat app">
    Login to [CometChat](https://app.cometchat.com/login) and select your app.
  </Step>

  <Step title="Enable Collaborative Document">
    Go to **Chat & Messaging --> Features**, under **Extentions** and enable **Collaborative Document**.
  </Step>
</Steps>

### How does it work?

Using the Collaborative Document extension is pretty straight-forward. As an initiator, you only have to create a session. The extension will handle the following for you:

* **Create a collaboration link**: Generate a document link for the session.
* **Invite collaborators**: Send the link as an invitation to receivers.

### Receiving the details

#### As an initiator

You will receive the `document_url` of the session in the success callback of the `callExtension` method.

#### As a collaborator

The receiver (can be a user or group) will get a message with the following properties:

1. category: `custom`
2. type: `extension_document`

Implement the Custom message listener to get the message. See [Receive Messages](/sdk/javascript/receive-message) documentation.

### Document metadata

```json theme={null}
"metadata": {
  "incrementUnreadCount": true,
  "@injected": {
    "extensions": {
      "document": {
        "document_url": "https://document.cometchat.io/p/uniqdocid"
      }
    }
  }
}
```

### Document Features

The Collaborative document has the following editing features:

1. Bold, Italic, Underline, Strikethrough
2. Numbered list, Bulleted list
3. Indent and Outdent

You can export your document as: Etherpad, HTML, or Plain text.

### Implementation

| Technology                                     | Support | Docs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| ---------------------------------------------- | ------- | 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| [UI Kit Builder](/chat-builder/react/features) | ✅       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| [Widget Builder](/widget/html/features)        | ✅       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| [UI Kits](/ui-kit/react/core-features)         | ✅       | <span style={{display: 'flex', gap: '8px', alignItems: 'center'}}><a href="/sdk/javascript/extensions/collaboration#collaborative-document" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/js.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=ac02c5c31b3694feeb4b07c73bd478cc" alt="JavaScript" width="16" height="16" style={{display: 'block'}} data-path="images/icons/js.svg" /></a><a href="/sdk/react-native/extensions/collaboration#collaborative-document" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/react.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=c00e3ae8e088c99fc43b5ca82a149802" alt="React Native" width="16" height="16" style={{display: 'block'}} data-path="images/icons/react.svg" /></a><a href="/sdk/android/extensions/collaboration#collaborative-document" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/android.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=f03fe7acbaded87373ae7f085318e005" alt="Android" width="16" height="16" style={{display: 'block'}} data-path="images/icons/android.svg" /></a><a href="/sdk/ios/extensions/collaboration#collaborative-document" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/swift.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=25f757820a35df0e38aaa5f211c0f26d" alt="iOS" width="16" height="16" style={{display: 'block'}} data-path="images/icons/swift.svg" /></a><a href="/sdk/flutter/extensions/collaboration#collaborative-document" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/flutter.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=261208c44e5880cbf04f70d560406a45" alt="Flutter" width="16" height="16" style={{display: 'block'}} data-path="images/icons/flutter.svg" /></a></span> |
| [SDK](/sdk/javascript/overview)                | ✅       | <span className="sdk-icons"><a href="/sdk/javascript/extensions/collaboration#collaborative-document"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/js.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=ac02c5c31b3694feeb4b07c73bd478cc" size={16} width="32" height="32" data-path="images/icons/js.svg" /></a><a href="/sdk/react-native/extensions/collaboration#collaborative-document"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/react.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=c00e3ae8e088c99fc43b5ca82a149802" size={16} width="32" height="32" data-path="images/icons/react.svg" /></a><a href="/sdk/android/extensions/collaboration#collaborative-document"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/android.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=f03fe7acbaded87373ae7f085318e005" size={16} width="32" height="32" data-path="images/icons/android.svg" /></a><a href="/sdk/ios/extensions/collaboration#collaborative-document"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/swift.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=25f757820a35df0e38aaa5f211c0f26d" size={16} width="32" height="32" data-path="images/icons/swift.svg" /></a><a href="/sdk/flutter/extensions/collaboration#collaborative-document"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/flutter.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=261208c44e5880cbf04f70d560406a45" size={16} width="32" height="32" data-path="images/icons/flutter.svg" /></a></span>                                                                                                                                                                                                                                                                                                                                                                                                                                                 |

***

## Collaborative whiteboard

Draw, sketch, and brainstorm together in real-time. Perfect for visual collaboration, design discussions, and interactive presentations.

**When to use:** Design reviews, brainstorming sessions, tutoring, technical diagrams, or any visual collaboration.

<Note>
  **Out-of-the-box in:** [UI Kit Builder](/chat-builder/react/features) ✅ | [Widget Builder](/widget/html/features) ✅ | [UI Kits](/ui-kit/react/extensions#collaborative-whiteboard) ✅ | [SDK](/sdk/javascript/overview) ✅
</Note>

<Frame>
  <img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/Be6Mu14MqhiP8v4-/images/extensions-collaborative-whiteboard.png?fit=max&auto=format&n=Be6Mu14MqhiP8v4-&q=85&s=085b5493b52398d625b1400fe129a79a" width="1280" height="712" data-path="images/extensions-collaborative-whiteboard.png" />
</Frame>

### Extension settings

<Steps>
  <Step title="Open your CometChat app">
    Login to [CometChat](https://app.cometchat.com/login) and select your app.
  </Step>

  <Step title="Enable Collaborative Whiteboard">
    Go to **Chat & Messaging --> Features**, under **Extentions** and enable **Collaborative Whiteboard**.
  </Step>
</Steps>

### How does it work?

Using the Collaborative Whiteboard extension is pretty straight-forward. As an initiator, you only have to create a session. The extension will handle the following for you:

* **Create a collaboration link**: Generate a whiteboard link for the session.
* **Invite collaborators**: Send the link as an invitation to receivers.

### Receiving the details

#### As an initiator

You will receive the `board_url` of the whiteboard session in the success callback of the `callExtension` method.

#### As a collaborator

The receiver (a user or group) will get a message with the following properties:

1. category: `custom`
2. type: `extension_whiteboard`

Implement the Custom message listener to get the message. See [Receive Messages](/sdk/javascript/receive-message) documentation.

### Whiteboard metadata

```json theme={null}
"metadata": {
  "@injected": {
    "extensions": {
      "whiteboard": {
        "board_url": "https://whiteboard-.cometchat.io?whiteboardid=abc"
      }
    }
  }
}
```

### Whiteboard Features

Our whiteboard implementation provides the following features:

1. **Edit**: Clear board, Undo, Redo
2. **Tools**: Mouse pointer, Select an area, Pen, Line, Rectangle, Circle, Text, Eraser
3. **Tool properties**: Thickness, Color
4. **Upload image to whiteboard**
5. **Export whiteboard as image**

### Implementation

| Technology                                     | Support | Docs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| [UI Kit Builder](/chat-builder/react/features) | ✅       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| [Widget Builder](/widget/html/features)        | ✅       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| [UI Kits](/ui-kit/react/core-features)         | ✅       | <span style={{display: 'flex', gap: '8px', alignItems: 'center'}}><a href="/sdk/javascript/extensions/collaboration#collaborative-whiteboard" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/js.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=ac02c5c31b3694feeb4b07c73bd478cc" alt="JavaScript" width="16" height="16" style={{display: 'block'}} data-path="images/icons/js.svg" /></a><a href="/sdk/react-native/extensions/collaboration#collaborative-whiteboard" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/react.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=c00e3ae8e088c99fc43b5ca82a149802" alt="React Native" width="16" height="16" style={{display: 'block'}} data-path="images/icons/react.svg" /></a><a href="/sdk/android/extensions/collaboration#collaborative-whiteboard" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/android.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=f03fe7acbaded87373ae7f085318e005" alt="Android" width="16" height="16" style={{display: 'block'}} data-path="images/icons/android.svg" /></a><a href="/sdk/ios/extensions/collaboration#collaborative-whiteboard" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/swift.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=25f757820a35df0e38aaa5f211c0f26d" alt="iOS" width="16" height="16" style={{display: 'block'}} data-path="images/icons/swift.svg" /></a><a href="/sdk/flutter/extensions/collaboration#collaborative-whiteboard" style={{textDecoration: 'none', border: 'none'}}><img src="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/flutter.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=261208c44e5880cbf04f70d560406a45" alt="Flutter" width="16" height="16" style={{display: 'block'}} data-path="images/icons/flutter.svg" /></a></span> |
| [SDK](/sdk/javascript/overview)                | ✅       | <span className="sdk-icons"><a href="/sdk/javascript/extensions/collaboration#collaborative-whiteboard"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/js.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=ac02c5c31b3694feeb4b07c73bd478cc" size={16} width="32" height="32" data-path="images/icons/js.svg" /></a><a href="/sdk/react-native/extensions/collaboration#collaborative-whiteboard"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/react.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=c00e3ae8e088c99fc43b5ca82a149802" size={16} width="32" height="32" data-path="images/icons/react.svg" /></a><a href="/sdk/android/extensions/collaboration#collaborative-whiteboard"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/android.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=f03fe7acbaded87373ae7f085318e005" size={16} width="32" height="32" data-path="images/icons/android.svg" /></a><a href="/sdk/ios/extensions/collaboration#collaborative-whiteboard"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/swift.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=25f757820a35df0e38aaa5f211c0f26d" size={16} width="32" height="32" data-path="images/icons/swift.svg" /></a><a href="/sdk/flutter/extensions/collaboration#collaborative-whiteboard"><Icon icon="https://mintcdn.com/cometchat-22654f5b-docs-platform-docs-release/nBkX5KhzzDWIdWuk/images/icons/flutter.svg?fit=max&auto=format&n=nBkX5KhzzDWIdWuk&q=85&s=261208c44e5880cbf04f70d560406a45" size={16} width="32" height="32" data-path="images/icons/flutter.svg" /></a></span>                                                                                                                                                                                                                                                                                                                                                                                                                                                 |

***

## Limitations

Keep these constraints in mind when using collaboration features:

| Constraint           | Document              | Whiteboard            |
| -------------------- | --------------------- | --------------------- |
| Max concurrent users | Recommended \< 50     | Recommended \< 20     |
| Session persistence  | Until manually closed | Until manually closed |
| File size limits     | Standard text limits  | Image uploads \< 5MB  |

<Note>
  Collaboration sessions remain active until explicitly closed. Consider implementing session cleanup for inactive sessions.
</Note>