> ## 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.

# Autodesk Platform Services Webhooks

> Develop and test Autodesk webhooks from localhost.

This guide shows you how to use ngrok to receive Autodesk Platform Services webhooks on your localhost app.

By integrating ngrok with Autodesk, you can:

* Develop and test Autodesk webhooks locally without deploying to a public environment or setting up HTTPS.
* Inspect and troubleshoot requests from Autodesk in real time via the inspection UI and API.
* Modify and replay Autodesk webhook requests with a single click instead of reproducing events manually in your Autodesk account.
* Secure your app with Autodesk 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).
* An Autodesk Platform Services account.

## 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.
</Tip>

* Start ngrok:

  ```bash theme={null}
  ngrok http 3000
  ```

* Copy the URL ngrok displays.
  Your app is now exposed at that URL for use with Autodesk.

## 3. Configure Autodesk to send webhooks

Autodesk Platform Services can send webhook requests to your app when events occur.
To register for those events:

* Sign in to [Autodesk Platform Services](https://aps.autodesk.com/).
* On the **Platform Services** page, click your avatar in the top-right, click **Applications**, then **Create Application**, enter a name in **Name**, and click **Create**.
* In **Client Credentials**, copy **Client ID** and **Client Secret** for later use.

<Tip>
  Click the eye icon to reveal **Client Secret** or use the copy icon.
</Tip>

* In **General Settings**, paste the ngrok URL in **Callback URL** (for example, `https://1a2b-3c4d-5e6f-7g8h-9i0j.ngrok.app`).
* In **API Access**, select **Data Management API** and **Webhooks API**, then click **Save changes**.

<Tip>
  This tutorial uses **Data Management** as an example; you can select other APIs for different Autodesk services.
</Tip>

* In a terminal, obtain an access token:

  ```bash theme={null}
  curl -v 'https://developer.api.autodesk.com/authentication/v1/authenticate' \
    -X 'POST' \
    -H 'Content-Type: application/x-www-form-urlencoded' \
    -d 'client_id=CLIENT_ID&client_secret=CLIENT_SECRET&grant_type=client_credentials&scope=data:read'
  ```

  Replace `CLIENT_ID` and `CLIENT_SECRET` with the values you copied.
  Copy the **access\_token** from the response.

* Register a webhook with the Data Management API:

  ```bash theme={null}
  curl -X 'POST' \
    -v 'https://developer.api.autodesk.com/webhooks/v1/systems/data/events/dm.*/hooks' \
    -H 'Content-Type: application/json' \
    -H 'authorization: Bearer ACCESS_TOKEN' \
    -d '{
      "callbackUrl": "CALLBACK_URL",
      "scope": { "folder": "FOLDER_URN" },
      "hookAttribute": { "projectId": "PROJECT_ID" },
      "filter": "$[?(@.ext=='\''txt'\'')]"
    }'
  ```

  Replace `ACCESS_TOKEN` with your access token, `CALLBACK_URL` with your ngrok URL, `FOLDER_URN` with your Data Management folder URN, and `PROJECT_ID` with your project ID.
  The response should be `HTTP/1.1 201`.

### Run webhooks with Autodesk and ngrok

Autodesk sends different requests depending on the event.
For example, adding a file to a folder in Data Management triggers a webhook.

* Open the folder you assigned to your webhook in Data Management, upload a text file, and confirm your localhost app receives a notification and logs both headers and body in the terminal.

### 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 Autodesk 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](/pricing-limits/traffic-policy-unit-pricing/) for details.
</Note>

To add verification:

* Register a webhook secret with the Autodesk API:

  ```bash theme={null}
  curl -X 'POST' \
    -v 'https://developer.api.autodesk.com/webhooks/v1/tokens' \
    -H 'Content-Type: application/json' \
    -H 'authorization: Bearer ACCESS_TOKEN' \
    -d '{ "token": "YOUR_WEBHOOK_SECRET" }'
  ```

  Replace `ACCESS_TOKEN` with your access token and `YOUR_WEBHOOK_SECRET` with a value you choose to sign each webhook request.
  The response should be `HTTP/1.1 200`.

* Create a Traffic Policy file named `autodesk_policy.yml`.
  Replace `{your client secret}` with your Autodesk **Client Secret**:

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

* Restart ngrok with the policy file:

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

* Upload a text file to the folder assigned to your webhook to trigger a request.

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