Webhook Tester

About Webhook Testing

A client-side tool for testing webhook integrations. Format payloads, verify GitHub/Stripe-style HMAC-SHA256 signatures, and generate curl commands to simulate webhook delivery.

Why verify webhook signatures?

Webhooks from GitHub, Stripe, and similar services include an HMAC signature in the header. Verifying it ensures the payload was not tampered with and originated from the expected service.

Key Features

• Payload formatter: Beautify and validate JSON webhook payloads.
• Signature verification: Verify HMAC-SHA256 (sha256=...) signatures locally.
• cURL generator: Build curl commands to send test webhooks to your endpoint.

Common Use Cases

• Validate webhook payload shape and HMAC logic before your full local integration is ready.
• Turn sample events from third-party platforms into reusable test requests for faster debugging.
• Format and inspect payloads before sharing them with teammates or wiring them into application code.

Verification Note

This page is useful for local formatting, signature demonstrations, and curl generation. In production, signature checks should still be based on the raw request body, constant-time comparison, and server-side secret management.