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Hygraph Webhooks

This guide covers how to use ngrok to integrate your localhost app with Hygraph by using Webhooks. Hygraph webhooks can be used to notify an external application whenever specific events occur in your Hygraph account.

By integrating ngrok with Hygraph, you can:

  • Develop and test Hygraph webhooks locally, eliminating the time in deploying your development code to a public environment and setting it up in HTTPS.
  • Inspect and troubleshoot requests from Hygraph in real-time via the inspection UI and API.
  • Modify and Replay Hygraph Webhook requests with a single click and without spending time reproducing events manually in your Hygraph account.
  • Secure your app with Hygraph validation provided by ngrok. Invalid requests are blocked by ngrok before reaching your app.

Step 1: Start your app

For this tutorial, we'll use the sample NodeJS app available on GitHub.

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

git clone
cd ngrok-webhook-nodejs-sample
npm install

This will get the project installed locally.

Now you can launch the app by running the following command:

npm start

The app runs by default on port 3000.

You can validate that the app is up and running by visiting http://localhost:3000. The application logs request headers and body in the terminal and responds with a message in the browser.

Step 2: Launch ngrok

Once your app is running successfully on localhost, let's get it on the internet securely using ngrok!

  1. If you're not an ngrok user yet, just sign up for ngrok for free.

  2. Download the ngrok agent.

  3. Go to the ngrok dashboard and copy your Authtoken.
    Tip: The ngrok agent uses the auth token to log into your account when you start a tunnel.

  4. Start ngrok by running the following command:

    ngrok http 3000
  5. ngrok will display a URL where your localhost application is exposed to the internet (copy this URL for use with Hygraph). ngrok agent running

Step 3: Integrate Hygraph

To register a webhook on your Hygraph account follow the instructions below:

  1. Access Hygraph and sign in using your Hygraph account.

  2. On the left menu, click Webhooks and then click Add Webhook.

  3. On the webhook popup, enter a name in the Name field and enter the URL provided by the ngrok agent to expose your application to the internet in the URL field (i.e. hygraph URL to Publish

  4. Select Asset in the Content Model field and then click Add at the top of the popup screen.

Run Webhooks with Hygraph and ngrok

Hygraph sends different request body contents depending on the event that is being triggered. You can trigger new calls from Hygraph to your application by following the instructions below.

  1. On the Hygraph home page, click Assets and then click + Add entry.

  2. On the Assets page, click Upload, select a file from your desktop, click Upload, and then click Save & Publish.

    Confirm your localhost app receives event notifications and logs both headers and body in the terminal.

    Alternatively, you can verify the log of the webhook call in Hygraph:

    1. On the left menu, click Webhooks and then click View Logs for your webhook, and then click one of the messages. Webhook Logs

Inspecting requests

When you launch the ngrok agent on your local machine, you can see two links:

  • The URL to your app (it ends with for free accounts or for paid accounts when not using custom domains)
  • A local URL for the Web Interface (a.k.a Request Inspector).

The Request Inspector shows all the requests made through your ngrok tunnel to your localhost app. When you click on a request, you can see details of both the request and the response.

Seeing requests is an excellent way of validating the data sent to and retrieved by your app via the ngrok tunnel. That alone can save you some time dissecting and logging HTTP request and response headers, methods, bodies, and response codes within your app just to confirm you are getting what you expect.

To inspect Hygraph's webhooks call, launch the ngrok web interface (i.e., and then click one of the requests sent by Hygraph.

From the results, review the response body, header, and other details:

ngrok Request Inspector

Replaying requests

The ngrok Request Inspector provides a replay function that you can use to test your code without the need to trigger new events from Hygraph. To replay a request:

  1. In the ngrok inspection interface (i.e. http://localhost:4040), select a request from Hygraph.

  2. Click Replay to execute the same request to your application or select Replay with modifications to modify the content of the original request before sending the request.

  3. If you choose to Replay with modifications, you can modify any content from the original request. For example, you can modify the operation field inside the body of the request.

  4. Click Replay.

Verify that your local application receives the request and logs the corresponding information to the terminal.

Secure webhook requests

The ngrok signature webhook verification feature allows ngrok to assert that requests from your Hygraph webhook are the only traffic allowed to make calls to your localhost app.

Note: This ngrok feature is limited to 500 validations per month on free ngrok accounts. For unlimited, upgrade to Pro or Enterprise.

This is a quick step to add extra protection to your application.

  1. Access Hygraph and sign in using your Hygraph account.

  2. On the left menu, click Webhooks, and click the pencil icon in your webhook tile.

  3. On the popup, enter a secret key that is at least 32 characters long in the Secret key field, and then click Update at the top of the popup screen.

  4. Restart your ngrok agent by running the command, replacing {your secret key} with the value you used in the Secret key field:

    ngrok http 3000 --verify-webhook graphcms --verify-webhook-secret {your secret key}
  5. On the Hygraph home page, create a new asset.

Verify that your local application receives the request and logs information to the terminal.