Webhook Testing — Free Tools & Guides for Every Provider

Webhook testing is the process of verifying that an HTTP endpoint correctly receives, validates, and processes webhook deliveries from a third-party service. A typical test involves a unique HTTPS URL that captures incoming requests so you can inspect headers, body, signatures, and retry behavior before deploying your handler to production.

Use a webhook tester that issues a public HTTPS URL and forwards requests to your local server. WebhookWhisper gives you a permanent endpoint plus configurable forwarding rules — paste the URL into your provider's dashboard, and incoming events are relayed to http://localhost:3000 (or any URL) with retry logic. No tunnel binary, no firewall changes.

Most providers sign webhooks with HMAC-SHA256 over the raw request body, attached as a header like Stripe-Signature or X-Hub-Signature-256. Verification recomputes the HMAC using your shared secret and compares it to the header. WebhookWhisper has copy-pasteable verification recipes for Node.js, Python, Go, Ruby, PHP, and Bash at /docs/webhook-signing.

No. Guest URLs are free and instant — click any provider page and a temporary endpoint is created on the spot, no signup required. Free accounts unlock permanent endpoints, 7-day event history, and forwarding rules; paid plans add longer history, more endpoints, and event replay.

Yes — every captured event can be replayed from the dashboard with one click. Replay re-sends the exact original payload to a target URL of your choice, useful for testing fixes against real production webhook data without waiting for a new event from the provider.

API clients send outbound requests; webhook testers receive inbound requests. When you're integrating Stripe, you don't initiate the call — Stripe sends a POST to your URL when an event happens. A webhook tester gives you that URL and shows what arrived. The two tools are complementary, not interchangeable.