---
title: "Rocket Chat Slash Command Examples"
slug: "slash-command-examples"
description: "Explore examples of Rocket Chat slash commands. Build secure, custom workflows to enhance collaboration efficiency."
updated: 2026-02-04T09:10:47Z
published: 2026-02-04T09:10:47Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://developer.rocket.chat/llms.txt
> Use this file to discover all available pages before exploring further.

# Slash Command Examples

In this section, we'll look at two slash command examples:

- Update user status value and text.
- Extend messages to include an image attachment and a custom field.

## Example 1: Update user status

To update the user status, we will create a new slash command that takes two parameters:

- The first parameter is the status value - online, away, busy, etc.
- The second contains the status text.

We will refer to the status slash command as `st` to execute code such as:

```plaintext
/st busy doing code :)
```

### Step 1: Create the slash command

To implement this, follow these steps:

1. Create a new class named `StatusUpdateCmd.ts` and place it in the same subdirectory `commands` that we created in the [previous section](/v1/docs/slash-commands).
2. Now, add the following code for the status update:

```typescript
import {
    IHttp,
    IModify,
    IPersistence,
    IRead,
} from '@rocket.chat/apps-engine/definition/accessors';
import { IRoom } from '@rocket.chat/apps-engine/definition/rooms';
import {
    ISlashCommand,
    SlashCommandContext,
} from '@rocket.chat/apps-engine/definition/slashcommands';
import { IUser } from '@rocket.chat/apps-engine/definition/users';

export class StatusUpdateCmd implements ISlashCommand {
   public command = 'st';
   public i18nParamsExample: string = 'status_update_command_params_example';
   public i18nDescription: string = 'status_update_command_description';
   public providesPreview: boolean = false;
   
   public async executor(context: SlashCommandContext, read: IRead, modify: IModify, http: IHttp, persis: IPersistence): Promise<void> {
       const user = context.getSender();
       const params = context.getArguments();
       const room: IRoom = context.getRoom();
       
       if (!params || params.length == 0) {
           return this.notifyMessage(room, read, user, "At least one status argument is mandatory. A second argument can be passed as status text.");
       }
       
       let status = params[0];
       let statusText = params.length > 1 ? params.slice(1).join(' ') : '';
       
       await modify.getUpdater().getUserUpdater().updateStatus(user, statusText, status);
       await this.notifyMessage(room, read, user, "Status updated to " + status + " (" + statusText + ").");
   }
   
   private async notifyMessage(room: IRoom, read: IRead, sender: IUser, message: string): Promise<void> {
       const notifier = read.getNotifier();
       const messageBuilder = notifier.getMessageBuilder();
       messageBuilder.setText(message);
       messageBuilder.setRoom(room);
       return notifier.notifyUser(sender, messageBuilder.getMessage());
    }
}
```

Here, we are implementing the following:

- Fetch the status value from the first argument. This argument is mandatory otherwise, the `notifyMessage` method informs the user that the argument is missing.
- Fetch the status message from the second argument, joining the terms with a white space. If the second argument is not passed, the status message remains an empty string.
- Update the status according to the value passed using `modify`.
- Notify the user about the status update.

### Step 2: Register the slash command

In the app's main class, register the new slash command as follows:

```typescript
public async extendConfiguration(configuration: IConfigurationExtend) {
        configuration.slashCommands.provideSlashCommand(new StatusUpdateCmd());
}
```

> [!WARNING]
> You can only have one `extendConfiguration` method in your app's main class. Therefore, make sure to add all your slash commands to this method.

Make sure to import the slash command class in the main class:

```typescript
import { StatusUpdateCmd } from './commands/StatusUpdateCmd';
```

All that remains is deployment and testing!

### Step 3: Deploy the app

In the command line, go to the app folder and run:

```bash
rc-apps deploy --url <server_url> -u <user> -p <pwd>
```

- The `&lt;server_url&gt;` parameter is the URL of your Rocket.Chat server.
- Replace the placeholders with the URL, username, and password for your server, respectively.

After executing this command, your application will be deployed to the server.

> **Packaging your app**
> 
> Alternatively, you can execute the `rc-apps package` command. This gives you a compressed zip file of your app that you can upload as a private app to your Rocket.Chat server.

### Step 4: Test the app

Send `/st &lt;status&gt; &lt;message&gt;` to any channel. You can see the change in the user status accordingly. The following screenshot shows the result when you enter `/st busy doing code :)`.

![](https://cdn.us.document360.io/27ca1fd4-36d7-4cde-b4eb-97fc1652954c/Images/Documentation/image(188).png)

If we execute `/st` with no input, we receive the notification:

![](https://cdn.us.document360.io/27ca1fd4-36d7-4cde-b4eb-97fc1652954c/Images/Documentation/image(94).png)

## Example 2: Extend messages

This example explains how to construct an app that is invoked via a slash command, sends a message, and is extended to include an image and a custom field. Rocket.Chat supports numerous attachments (with applicable customizations). For instance, you can attach images, documents, videos, and audio files to messages.

### Step 1: Create the slash command

To implement this, follow these steps:

1. Create a new class named `ExtendMessageCommand.ts` and place it in the same subdirectory `commands` that we created in the [previous section](/v1/docs/slash-commands).
2. Now, add the following code:

```typescript
import { IHttp, IModify, IPersistence, IRead, IMessageExtender } from '@rocket.chat/apps-engine/definition/accessors';
import { ISlashCommand, SlashCommandContext } from '@rocket.chat/apps-engine/definition/slashcommands';
import { IMessageAttachment } from '@rocket.chat/apps-engine/definition/messages';

class ImageAttachment implements IMessageAttachment {
    imageUrl?: string;

    constructor(imgUrl: string) {
        this.imageUrl = imgUrl;
    }
}

export class ExtendMessageCommand implements ISlashCommand {
    public command = 'extend-message';
    public i18nParamsExample = '';
    public i18nDescription = '';
    public providesPreview = false;

    public async executor(context: SlashCommandContext, read: IRead, modify: IModify, http: IHttp, persis: IPersistence): Promise<void> {
        try {
            // Send message [1]
            const messageId = await this.sendMessage(context, modify, 'Sending a message!');
            
            // Get message extender [2]
            const messageExtender = await this.getMessageExtender(context, modify, messageId);
            
            // Create and add image attachment [3]
            const img = new ImageAttachment('https://test.rocket.chat/images/logo/logo.svg');
            messageExtender.addAttachment(img); // [4]
            
            // Finish extending [5]
            await modify.getExtender().finish(messageExtender);
            
            await this.notifyUser(context, read, 'Message extended successfully with image!');
            
        } catch (error) {
            await this.notifyUser(context, read, `ERROR: ${error.message || error}`);
        }
    }

    private async sendMessage(context: SlashCommandContext, modify: IModify, message: string): Promise<string> {
        const messageStructure = modify.getCreator().startMessage();
        const sender = context.getSender();
        const room = context.getRoom();

        messageStructure
            .setSender(sender)
            .setRoom(room)
            .setText(message);

        return modify.getCreator().finish(messageStructure);
    }

    private async getMessageExtender(context: SlashCommandContext, modify: IModify, messageId: string): Promise<IMessageExtender> {
        const sender = context.getSender();
        return modify.getExtender().extendMessage(messageId, sender);
    }

    private async notifyUser(context: SlashCommandContext, read: IRead, message: string): Promise<void> {
        const notifier = read.getNotifier();
        const messageBuilder = notifier.getMessageBuilder();
        messageBuilder.setText(message);
        messageBuilder.setRoom(context.getRoom());
        await notifier.notifyUser(context.getSender(), messageBuilder.getMessage());
    }
}
```

The main actions performed by the code above are:

- [1] Sends a message and stores the sent message's ID in the `messageId` variable.
- [2] Uses the sent message's ID. The `messageExtender` object is returned by the `getMessageExtender` method and stored in the `messageExtender` variable.
- [3] Creates the attachment object as an instance of the `ImageAttachment` class. Here, the attachment is an image.
- [4] Adds the image attachment to the message using the `addAttachment` method from the `messageExtender` object. Many attachments can be added all at once using the `addAttachments` method.
- [5] Finishes the `modifyExtender` object, which is crucial to apply the extensions made to the message and make them visible to the user.

**Method:**`sendMessage`

The `sendMessage` method needs to return the message's ID after it has been sent. The method must return a `Promise&lt;string&gt;`.

**Method:**`getMessageExtender`

After obtaining the message's ID, we can get the `messageExtender` object, which enables the addition of custom fields and attachments.

### Step 2: Add image attachment class

We will implement the `ImageAttachment` class in the same class:

```typescript
import { IMessageAttachment } from '@rocket.chat/apps-engine/definition/messages';

export class ImageAttachment implements IMessageAttachment{
    imageUrl?: string;
    constructor(imgUrl: string){
        this.imageUrl = imgUrl;
    }
}
```

Here, we use a class attribute with the same identifier and type as in the `IMessageAttachment` interface, which is required for your linked media to be visible to the user. This is because only the variables in your attachment class defined in the `IMessageAttachment` interface will be used to retrieve the attachment's media.

You can also construct your own classes for video or audio attachments, or you can group them all into a single class that can accommodate all of these possibilities. Make sure to use the same attributes described in the `IMessageAttachment.d.ts` file.

> [!NOTE]
> The audio and video formats that are supported in the Rocket.Chat message attachments are identical to HTML audio and video elements.

### Step 3: Register the slash command

We must register the slash command in the app's main class, the project's root.

```typescript
import { App } from '@rocket.chat/apps-engine/definition/App';
import { IAppInfo } from '@rocket.chat/apps-engine/definition/metadata';
import { ExtendMessageCommand } from './slashcommands/ExtendSlashcommand'; // [1]

export class RocketChatTester extends App {
    constructor(info: IAppInfo, logger: ILogger, accessors: IAppAccessors) {
        super(info, logger, accessors);
    }

    public async extendConfiguration(configuration: IConfigurationExtend) {
        configuration.slashCommands.provideSlashCommand(new ExtendMessageCommand()); // [2]
    }
}
```

Here, we import our new slash command class and register it in the app's configuration.

### Step 5: Deploy the app

To deploy the app, follow [the deployment steps highlighted](/v1/docs/slash-command-examples#step-3-deploy-the-app) in the previous example.

### Step 6: Test the slash command

After the app has been deployed, execute the slash command `/extend-message` in any channel.

When you execute the registered slash command, a message is sent to the current channel and altered to include the image attachment. The attached image is visible in the message after editing.

The following screenshot shows an example:

![](https://cdn.us.document360.io/27ca1fd4-36d7-4cde-b4eb-97fc1652954c/Images/Documentation/image(190).png)