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Microsoft Teams Messaging Extension Middleware for Microsoft Bot Builder

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This middleware for Bot Builder Framework is targeted for Microsoft Teams based bots.

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The Microsoft Teams Messaging Extension Middleware for Microsoft Bot Builder makes building bots for Microsoft Teams easier. By separating out the logic for Message Extensions from the implementation of the bot, you will make your code more readable and easier to debug and troubleshoot.

The middleware supports the following Message Extension features


To implement a Messaging Extension handler create a class like this:

NOTE: When combining this with the botbuilder-teams you should avoid using the invokeActivityHandler.onInvoke, as it might invalidate your messaging extension results.

import { TurnContext, CardFactory, MessagingExtensionQuery, MessagingExtensionResult } from "botbuilder";
import { IMessagingExtensionMiddlewareProcessor } from "botbuilder-teams-messagingextensions";

export default class MyMessageExtension implements IMessagingExtensionMiddlewareProcessor {

    public async onQuery(query: MessagingExtensionQuery): Promise<MessagingExtensionResult> {
        const card = CardFactory.heroCard("Test", "Test", [""]);

        if (query.parameters && query.parameters[0] && query.parameters[0].name === "initialRun") {
            return Promise.resolve({
                type: "result",
                attachmentLayout: "grid",
                attachments: [
        } else {
            return Promise.resolve({
                type: "result",
                attachmentLayout: "list",
                attachments: [

    public async onQuerySettingsUrl(): Promise<{ title: string, value: string }> {
        return Promise.resolve({
            title: "Configuration",
            value: "https://my-service-com/config.html"

    public async onSettingsUpdate(context: TurnContext): Promise<void> {
        const setting = context.activity.value.state;
        // Save the setting
        return Promise.resolve();

To add the processor to the pipeline use code similar to this:

import { MessagingExtensionMiddleware } from "botbuilder-teams-messagingextensions";

const adapter = new BotFrameworkAdapter(botSettings);
adapter.user(new MessagingExtensionMiddleware("myCommandId", new MyMessageExtension()));

Where you should match the command id with the one in the Teams manifest file:

"composeExtensions": [{
    "botId": "12341234-1234-1234-123412341234",
    "canUpdateConfiguration": true,
    "commands": [{
        "id": "myCommandId",
        "title": "My Command",
        "description": "...",
        "initialRun": true,
        "parameters": [...]

Use message actions and task modules

To create an message action that shows a task module for your input define your message extension as follows in the manifest. The fetchTask property set to true indicates that we want to use a task module.

    "id": "createToDoMessageExtension",
    "title": "Create To-Do",
    "description": "Create a To-Do item",
    "context": ["message", "commandBox", "compose"],
    "fetchTask": true,
    "type": "action"

In the processor you need to implement the onFetchTask and onSubmitAction methods. You can either return a card using the card property or use the url parameter to point to a web page.

public async onFetchTask(context: TurnContext, value: MessagingExtensionAction): Promise<MessagingExtensionResult | TaskModuleContinueResponse> {
    return Promise.resolve<ITaskModuleResult>({
        type: "continue",
            value: {
            title: "Task Module",
            card: CardFactory.adaptiveCard({
                $schema: "",
                type: "AdaptiveCard",
                version: "1.0",
                body: [
                        type: "TextBlock",
                        text: "Please enter your e-mail"
                        type: "Input.Text",
                        id: "myEmail",
                        placeholder: "",
                        style: "email"
                actions: [
                        type: "Action.Submit",
                        title: "OK",
                        data: { id: "unique-id" }

// handle response in here
public async onSubmitAction(context: TurnContext, value: MessagingExtensionAction): Promise<MessagingExtensionResult> {
   const email =;
   const id =;



Copyright (c) Wictor Wilén. All rights reserved.

Licensed under the MIT license.

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