---
title: "Clerk Webhook Tester — Test & Inspect Online | WebhookRelay"
meta:
  "og:description": "Test and inspect Clerk webhooks online with a free webhook tester URL — capture real Clerk payloads, read the signature header, then forward locally."
  "og:title": "Clerk Webhook Tester — Test & Inspect Online"
  description: "Test and inspect Clerk webhooks online with a free webhook tester URL — capture real Clerk payloads, read the signature header, then forward locally."
---

![Stripes](https://webhookrelay.com/blog/clerk-webhook-tester/images/stripes.svg)

# **Clerk Webhook Tester — Test & Inspect Online**

Test and inspect Clerk webhooks online with a free webhook tester URL — capture real Clerk payloads, read the signature header, then forward locally.

![Clerk Webhook Tester — Test & Inspect Clerk Webhooks Online](https://webhookrelay.com/blog/clerk-webhook-tester/images/blog/heroes/tester.jpg)

If you are wiring up Clerk webhooks, the first question is always the same: _what does Clerk actually send?_ The docs show an idealised payload, but the real request — its headers, its `svix-signature` header, the exact JSON shape — is what your handler has to parse. A **Clerk webhook tester** gives you a public URL that captures those real requests so you can read every byte before you write any code.

## [Get a free Clerk webhook tester URL](#get-a-free-clerk-webhook-tester-url)

The fastest way is our free [Webhook Bin](https://webhookrelay.com/blog/clerk-webhook-tester/webhook-bin/) — a no-code [webhook tester](https://webhookrelay.com/blog/clerk-webhook-tester/webhook-bin/) that gives you an instant public URL and stores every request that hits it, headers and body included. No signup, no deploy:

1. Open the [Webhook Bin](https://webhookrelay.com/blog/clerk-webhook-tester/webhook-bin/) and copy the URL it generates for you.
2. In **Clerk Dashboard → Webhooks (powered by Svix)**, add a webhook endpoint and paste that URL.
3. Trigger an event (see below) and watch the request land in the bin in real time.

Because the bin keeps the full request, you can inspect the `svix-signature` header, the `Content-Type`, and the complete payload — the three things you need to build and verify a handler.

## [What a Clerk webhook looks like](#what-a-clerk-webhook-looks-like)

Clerk delivers webhooks as an HTTP POST with a `application/json` body. Clerk uses Svix under the hood, so the signature scheme (`svix-id`, `svix-timestamp`, `svix-signature`) is identical to many other Svix-powered providers — learn it once on a captured payload and it transfers everywhere.

A typical `user.created` payload looks like this:

```
{
  "type": "user.created",
  "object": "event",
  "data": {
    "id": "user_...",
    "email_addresses": [
      {
        "email_address": "jon@example.com"
      }
    ],
    "first_name": "Jon"
  }
}
```

Common Clerk events you will want to test:

- `user.created`
- `user.updated`
- `session.created`
- `organization.created`

## [Verifying the Clerk signature](#verifying-the-clerk-signature)

Clerk signs each request so you can prove it really came from Clerk. The signature travels in the **`svix-signature`** header and is base64 HMAC-SHA256 over `svix-id.svix-timestamp.body`, with `svix-id` and `svix-timestamp` headers, using the signing secret that starts with `whsec_`. Capture a real request first, then use our [HMAC signature verifier](https://webhookrelay.com/blog/clerk-webhook-tester/hmac-verification/) and the [verify a webhook signature](https://webhookrelay.com/blog/clerk-webhook-tester/blog/verify-webhook-signature/) guide to confirm your verification logic against a payload you can actually see.

## [From inspecting to receiving on localhost](#from-inspecting-to-receiving-on-localhost)

A bin is perfect for _seeing_ the payload. When you are ready to drive your **local** handler with real Clerk events — without deploying — forward them straight to `localhost` with the Webhook Relay agent. The full walkthrough is here: [Receive Clerk webhooks on localhost](https://webhookrelay.com/blog/clerk-webhook-tester/blog/receive-clerk-webhooks-locally/).

That gives you a stable public URL that tunnels to your machine, so Clerk keeps delivering to the same endpoint while you iterate on `localhost`, no firewall changes or public IP required.

## [Test Clerk webhooks online in three steps](#test-clerk-webhooks-online-in-three-steps)

1. **Capture** — point Clerk at a [Webhook Bin](https://webhookrelay.com/blog/clerk-webhook-tester/webhook-bin/) URL and inspect the real request.
2. **Verify** — confirm the `svix-signature` header with the [HMAC verifier](https://webhookrelay.com/blog/clerk-webhook-tester/hmac-verification/).
3. **Forward** — when the shape is clear, [receive Clerk webhooks on localhost](https://webhookrelay.com/blog/clerk-webhook-tester/blog/receive-clerk-webhooks-locally/) and build your handler.

New to webhooks in general? Start with [what is a webhook](https://webhookrelay.com/blog/clerk-webhook-tester/blog/what-is-webhook/) and [how to test webhooks](https://webhookrelay.com/blog/clerk-webhook-tester/blog/how-to-test-webhooks/).

Ready to inspect your first Clerk event? [Open a free Webhook Bin](https://webhookrelay.com/blog/clerk-webhook-tester/webhook-bin/) and paste the URL into Clerk.