Stripe-style Idempotency-Key middleware for Hono. IETF draft-ietf-httpapi-idempotency-key-header compliant.

Express middleware for idempotent POSTs via Idempotency-Key with in-flight control and pluggable stores.

Exactly-once idempotency key ledger for retried operations, as a Convex component

Idempotency-key dedup store for the BATCH consumer (Section 23 BATCH)

SDK first-party de la Qoriva Platform Application API (ADR-020a): OIDC por token provider, Idempotency-Key, correlation id y reintentos seguros. Sin dependencias (fetch nativo).

Deterministic idempotency key manager for JSON payloads with multi-backend storage, an execute-once runner, and HTTP middleware. Zero dependencies.

Offline-first sync queue untuk POS — penyimpanan IndexedDB (Dexie.js) dengan idempotency key mencegah struk ganda.

HTTP idempotency-key interceptor for NestJS (Express + Fastify), zero runtime dependencies

Neetru SDK 3.0 — biblioteca runtime universal (browser/Node/Edge) para consumir o ecossistema Neetru. Paths canonical /api/sdk/v1/*, productId obrigatório, Idempotency-Key em mutations, WebCrypto signatures, baseUrl allowlist fail-closed.

Zero-dependency, fetch-first HTTP resilience toolkit: retries with backoff/jitter, per-attempt timeout + total deadline, idempotency-key, interceptor hooks, and standardized errors. Node.js, Bun, browsers.

@youneed/server middleware: Idempotency-Key — safe retries of unsafe requests via a pluggable KV store.

Defense-in-depth inbound webhook verification: HMAC-SHA256 timing-safe verify, dual-layer path-token + signature, idempotency-key replay protection

Coord-Box — distributed coordination primitives for Node.js: counting semaphores and an idempotency-key registry. Zero runtime dependencies. Pluggable backends (in-memory, Redis) and framework adapters.

ISL Standard Library - Idempotency Key Management

Idempotency-Key middleware for OmniAPI: prevent duplicate writes from client retries

Fork of PortOne JavaScript SDK for server-side usage (adds Idempotency-Key support)

Agent-side client SDK for the Facet Terminal protocol. Handles KYA bearer tokens, structured error envelopes, X-Agent-Trace-Id propagation, X-Facet-RateLimit-* capture, and idempotency-key forwarding. Runs on Node 20+, Bun, and Deno. Native fetch + AbortC

Idempotency key utilities for duplicate-safe processing and sync retries.

Idempotency key enforcement for NestJS — replay cached responses, prevent duplicate mutations, pluggable store (in-memory / Redis)

The idempotency package for the Powertools for AWS Lambda (TypeScript) library. It provides options to make your Lambda functions idempotent and safe to retry.