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

# Microsoft Teams Webhooks

> Develop and test Microsoft Teams webhooks from localhost.

<Note title="Need a different webhook provider?">
  If you don't see your preferred webhook provider, you can [request support for it](https://dashboard.ngrok.com/early-access#webhook-providers).
</Note>

This guide explains how to use ngrok to receive Microsoft Teams webhooks on your localhost app.

By integrating ngrok with Microsoft Teams, you can:

* Develop and test Microsoft Teams webhooks locally without deploying to a public environment or setting up HTTPS.
* Inspect and troubleshoot requests from Microsoft Teams in real time via the inspection UI and API.
* Modify and replay Microsoft Teams webhook requests with a single click instead of reproducing events manually in your Microsoft Teams account.
* Secure your app with Microsoft Teams webhook validation provided by ngrok.
  Invalid requests are blocked by ngrok before reaching your app.

## What you'll need

* An [ngrok account](https://ngrok.com/signup) and your [authtoken](https://dashboard.ngrok.com/get-started/your-authtoken).
* The [ngrok agent](https://ngrok.com/download) installed.
* [Node.js](https://nodejs.org/) installed (for the sample app, or use your own app).
* A Microsoft account and a Microsoft Teams page with an app.

<Note>
  This integration requires an ngrok Pay-as-you-go plan because Microsoft Teams validates your ngrok domain and certificate.
</Note>

## 1. Start your app

For this tutorial, you can use the [sample Node.js app on GitHub](https://github.com/ngrok/ngrok-webhook-nodejs-sample).

To install the sample, run the following in a terminal:

```bash theme={null}
git clone https://github.com/ngrok/ngrok-webhook-nodejs-sample.git
cd ngrok-webhook-nodejs-sample
npm install
```

Then start the app:

```bash theme={null}
npm start
```

The app runs on port 3000 by default.

You can confirm it's running by visiting `http://localhost:3000`.
The app logs request headers and body in the terminal and shows a message in the browser.

## 2. Expose your app with ngrok

Once your app is running locally, you're ready to put it online securely using ngrok.

* Copy [your ngrok authtoken](https://dashboard.ngrok.com/get-started/your-authtoken) from the dashboard.

<Tip>
  The ngrok agent uses your authtoken to authenticate when you start a tunnel.
  You need a reserved domain: in the dashboard, expand **Gateway**, click **Domains**, then **+ Create Domain** or **+ New Domain**, and reserve a domain (for example, `myexample.ngrok.app`).
</Tip>

* Start ngrok with your reserved domain:

  ```bash theme={null}
  ngrok http 3000 --url myexample.ngrok.app
  ```

* Copy the URL ngrok displays (for example, `https://myexample.ngrok.app`).
  Your app is now exposed at that URL for use with Microsoft Teams.

## 3. Configure Microsoft Teams to send webhooks

Microsoft Teams can send webhook requests to your app when you use an outgoing webhook in a channel.
To set it up:

* Sign in to the [Microsoft Teams web interface](https://teams.microsoft.com/) (or use the Teams app).
* Click **Teams**, select a channel, and click the **+** at the top of the team page.
* In **Add a tab**, click **Manage apps** and then **Create an outgoing webhook** at the bottom.
* In **Create an outgoing webhook**, enter **Name** and **Description** (for example, `My local app`) and your ngrok URL in **Callback URL** (for example, `https://myexample.ngrok.app`).
* Click **Create** and note the **Security token** on the confirmation popup, then click **Close**.

### Run webhooks with Microsoft Teams and ngrok

The outgoing webhook acts as a bot: when you @mention it, it sends the message to your app.

* In a channel, type `@My local app` (or your webhook name) and press Enter.

Your localhost app receives the notification and logs both headers and body in the terminal.
The bot may reply with a message such as `{ message: "Thank you for the message" }`.

### Inspecting requests

ngrok's [Traffic Inspector](https://dashboard.ngrok.com/traffic-inspector) captures all requests made through your ngrok endpoint to your localhost app.
Select any request to view detailed information about both the request and response.

<Info>
  To avoid exposing secrets, accounts only collect traffic metadata by default.
  You must enable full capture in the **Traffic Inspector** section of [your account settings](https://dashboard.ngrok.com/settings) to capture complete request and response data.
</Info>

Use the traffic inspector to:

* Validate webhook payloads and response data
* Debug request headers, methods, and status codes
* Troubleshoot integration issues without adding logging to your app

### Replaying requests

Test your webhook handling code without triggering new events from your service using the Traffic Inspector's replay feature:

1. Send a test webhook from your service to generate traffic in your Traffic Inspector.

2. Select the request you want to replay in the traffic inspector.

3. Choose your replay option:
   * Click **Replay** to send the exact same request again
   * Select **Replay with modifications** to edit the request before sending

4. (Optional) Modify the request: Edit any part of the original request, such as changing field values in the request body.

5. Send the request by clicking **Replay**.

Your local application will receive the replayed request and log the data to the terminal.

## Secure webhook requests

ngrok can verify that incoming requests are from your Microsoft Teams webhook so only that traffic reaches your app.

<Note>
  Webhook verification is limited to 500 validations per month on free accounts.
  If you need more, you can upgrade to Hobbyist or Pay-as-you-go.
  See [TPU Pricing](/docs/pricing-limits/traffic-policy-unit-pricing/) for details.
</Note>

To add verification:

* Use the **Security token** you copied when creating the outgoing webhook (see [Configure Microsoft Teams to send webhooks](#3-configure-microsoft-teams-to-send-webhooks)).

* Create a Traffic Policy file named `teams_policy.yml`.
  Replace `{your app secret}` with that Security token:

  ```yaml theme={null}
  on_http_request:
    - actions:
        - type: verify-webhook
          config:
            provider: microsoft_teams
            secret: "{your app secret}"
  ```

* Restart ngrok with the policy file:

  ```bash theme={null}
  ngrok http 3000 --traffic-policy-file teams_policy.yml
  ```

* In Teams, send another message using the @mention for your webhook.

Your app should receive the request and log it in the terminal.