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Zendesk Webhooks

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

By integrating ngrok with Zendesk, you can:

  • Develop and test Zendesk 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 Zendesk in real-time via the inspection UI and API.
  • Modify and Replay Zendesk Webhook requests with a single click and without spending time reproducing events manually in your Zendesk account.
  • Secure your app with Zendesk 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 Zendesk). ngrok agent running

Step 3: Integrate Zendesk

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

  1. Access Zendesk, and sign in using your Zendesk account.

  2. On the left menu, click the gear icon named Admin and then click Go to Admin Center.

  3. On the Admin Center page, click Apps and integrations on the left menu, and then click Webhooks.

  4. On the Get started with webhooks page, click Create Webhooks.

  5. In the Create webhook page, provide your webhook with a Name and in the Endpoint URL field enter the URL provided by the ngrok agent to expose your application to the internet (i.e. Your endpoint URL

  6. On the same page, select POST for the Request method field and select JSON for the Request format field. Tip: For your production webhooks, it's recommended to implement your application with either Basic Authentication or Bearer token authentication method. For this tutorial, leave the Authentication field selected as None as the sample application doesn't require any sort of authentication.

  7. Click Test webhook and then click Send test.

  8. Confirm your localhost app receives the test event notification and logs both headers and body to the terminal, then click Create on the Create webhook page.

  9. On the left menu, click Objects and rules and then click Automations under the Business rules section.

  10. On the Automations page, click Add automation and configure the title, conditions, and actions as per the following image. Automation Rule

  11. In the Perform these actions, enter a message like the following for the JSON body: {"message":"{{}} we are setting your ticket {{ticket.title}} to urgent priority."}

    In this automation example, a high-priority incident ticket will be set to urgent priority and Zendesk will call your sample application to communicate about this action.

  12. Click Create automation.

Run Webhooks with Zendesk and ngrok

As per the previous configuration, you've selected to trigger your webhook anytime a high-priority incident ticket is created. Zendesk sends different request body contents depending on the automation rules you create. Follow the instructions below to test your webhook with a new ticket.

  1. On the same browser, access Zendesk and sign in using your Zendesk account.

  2. On the top left corner of the home page, mouse over + Add, and then click Ticket under the New section.

  3. In the New ticket page, select a user for the Requester field, select Incident for the Type field, select High for the Priority field, enter a subject, and then click Submit as New.

    Zendesk evaluates automation rules every hour. You may need to wait about an hour until Zendesk makes the call to the webhook and your application receives the message about your ticket.

  4. Optionally, on the Admin Center page, access the Webhooks link on the left menu, click your webhook, click the Activity tab, and then click the last log that appears on the page. Zendesk Webhook logs

    Confirm the post request sent by Zendesk is the same as the request received by the localhost application.

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

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 Zendesk. To replay a request:

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

  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 BODY field and provide a different JSON message.

  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 Zendesk 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 Zendesk, and sign in using your Zendesk account.

  2. On the left menu, click the gear icon named Admin and then click Go to Admin Center.

  3. On the Admin Center page, click Apps and integrations on the left menu, and then click Webhooks.

  4. On the Webhooks page, click your webhook.

  5. In your webhook page, click Reveal secret and click Copy to copy the Secret key value.

  6. Restart your ngrok agent by running the command, replacing {your secret key} with the value you copied before:

    ngrok http 3000 --verify-webhook zendesk --verify-webhook-secret {your secret key}
  7. Execute the procedures in the Run Webhooks with Zendesk and ngrok section to create a new ticket.

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