How to Test CircleCI Webhooks
CircleCI webhooks notify your services about workflow and job completion events so you can trigger downstream deployments and alerts.
Looking for the broader picture? See the 7 best webhook testing tools (2026), or if you're already on Webhook.site, the 60-second migration to HookRay.
CircleCI Official Webhook Docs1. CircleCI Webhook Events
CircleCI can send the following webhook events to your endpoint:
workflow-completedjob-completed2. Set Up a Test Endpoint with HookRay
Follow these steps to start receiving CircleCI webhooks for testing:
- Go to HookRay and click "Start Testing — Free" to get your unique webhook URL.
- Copy the URL (e.g.,
https://h.hookray.com/abc123). - In your CircleCI dashboard, navigate to the webhook settings and paste the HookRay URL as your endpoint.
- Select the events you want to receive (see list above).
- Trigger a test event — HookRay will show the incoming webhook in real-time.
3. Sample CircleCI Webhook Payload
Here's an example of what a CircleCI webhook payload looks like:
{
"type": "workflow-completed",
"id": "3888f21b-eaa7-38e3-8f3d-75a63bba8895",
"happened_at": "2026-03-20T13:15:00.000Z",
"webhook": {
"name": "production-deploy"
},
"workflow": {
"id": "abc123-def456",
"name": "build-and-deploy",
"status": "success",
"created_at": "2026-03-20T13:10:00.000Z"
},
"project": {
"slug": "gh/acme/hookray"
},
"pipeline": {
"number": 412
}
}4. Frequently Asked Questions
How do I test CircleCI webhooks without deploying?
Use HookRay to get an instant public webhook URL. Paste it into your CircleCI dashboard's webhook configuration, trigger an event, and watch the payload arrive in real time. No code, no ngrok, no deployment required. The free tier captures 100 requests per month and works on all CircleCI event types.
Why aren't my CircleCI webhooks arriving?
The four most common causes: (1) the endpoint URL isn't publicly accessible — CircleCI can't reach localhost; (2) the wrong events are subscribed in your CircleCI dashboard; (3) signature verification is rejecting the request before your handler runs; (4) CircleCI can't reach your server because of a firewall, expired SSL certificate, or wrong DNS. Use HookRay's URL to isolate which of these four is failing — if HookRay receives the webhook, the problem is in your handler. If HookRay doesn't, the problem is in CircleCI configuration.
Why am I getting 400 or 500 errors from my CircleCI webhook?
CircleCI reports the response status your endpoint returned. HookRay accepts any payload and returns 200 OK by default, so if you see 400/500 in your CircleCI dashboard while pointing at HookRay, the issue is in CircleCI's configuration (wrong event, malformed signing secret, etc.). If you point at your own endpoint and get 400/500, the issue is in your handler — capture the request with HookRay, replay it locally, and debug from the captured payload.
How do I verify CircleCI webhook signatures?
CircleCI signs each webhook request with a shared secret. Capture the raw headers and body using HookRay, then verify the signature in your application using CircleCI's SDK or a standard HMAC library. Once verification works against HookRay-captured data, you can safely deploy. CircleCI's docs (linked above) cover the exact signing algorithm.
Can I replay a captured CircleCI webhook?
Yes — HookRay's replay feature re-sends any captured webhook to a different endpoint with one click. This is the fastest way to fix a buggy handler: capture the payload once, fix your code, and replay until it works. No need to re-trigger the event in CircleCI.
5. Next Steps
- Use HookRay's webhook replay feature to re-send captured webhooks while building your handler
- Enable smart parsing (Pro plan) to see CircleCI-specific fields highlighted automatically
- Check the CircleCI webhook documentation for the complete event reference
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Start Testing CircleCI Webhooks — FreeFree PDF: Webhook Testing Cheat Sheet 2026
One-page reference for 50+ APIs — canonical events, signing methods, sample payloads. Print it, pin it, share it.
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