Idempotency Key / Dedup Visualizer

Fire the same logical request with retries and compare side effects with vs without an idempotency key store.

Idempotency Key / Dedup

Simulate retries of the same logical request — with and without idempotency keys — and watch duplicate side effects.

Without key
    With idempotency key
        Store responses by key for a TTL window. Same key + same payload → return cached result. Different key → new side effect. Pair with outbox for exactly-once effect intent across brokers.
        When You Need It
        • Payment charges and transfers
        • Resource creation APIs (POST that isn’t naturally upsertable)
        • Email / notification sends
        • Consumers processing at-least-once Kafka messages
        Store keyed responses for a TTL window; make sure key scope includes the actor and operation semantics you care about.