idempotency-redis

idempotency-redis (v1.5.1) is a Node.js library that guarantees idempotent execution of operations using Redis for shared state and distributed locking. It ensures that for a given idempotency key, only one execution occurs; concurrent calls with the same key replay the cached result (including errors). Built on ioredis and using Redlock for distributed mutex, it differentiates from simple Redis-based idempotency by handling concurrent requests, caching failures, and providing custom error handling callbacks. Released as stable (since v1), with peer dependency ioredis 5.x.