THE LAB · WEBHOOK RELIABILITY

Show-Ready Checkout

A compact Node/Express project built to demonstrate safer webhook handling with HMAC signature verification, idempotency, automated tests, and CI.

PROBLEM

Success can still be dangerous.

A provider may retry the same event. Without idempotency, a successful handler can repeat a side effect that should only happen once.

PATTERNS

Verify, identify, process safely.

The project demonstrates request signing, duplicate-event protection, deterministic behavior, and automated verification of the unhappy path.

DEVREL VALUE

Built to teach, not just to ship.

The implementation is intentionally small enough to explain clearly, demo live, break on purpose, and use as a reference project.

PAIR IT WITH THE TUTORIAL

Your webhook worked. Then it worked again.

Read the companion breakdown on duplicate delivery, signatures, retries, and idempotency.

Read the tutorial →