Toy API implementing idempotency keys using Golang & Clean Architecture

🚥 Idempotency Handler, for making sure incoming requests are idempotent. Useful for payments, "at least once delivery" systems and more.

Gem for supporting idempotency in your Grape APIs

makes any request idempotent across nodejs frameworks like nestjs, express, fastify

Idempotency middleware for Express, Fastify and Hono

Stripe-style Idempotency-Key middleware for Hono with KV/D1/Memory stores

📚 Microservice Architecture course

Полнофункциональный демонстрационный сервер на базе библиотеки Wattle

Примеры использования Wattle

This repository implements a robust Wallet System designed for handling user accounts, balances, and transactions with full support for idempotency, atomic operations, and auditability. The system ensures correctness even when deployed across multiple machines

Drop-in Idempotency-Key support for Spring Boot 3 APIs. Every POST/PUT/PATCH retry returns the cached response — exact same body, status, headers — instead of charging twice, double-creating orders, or re-sending webhooks. JDBC and Redis backends, Stripe-style mismatch detection, zero controller changes.

HTTP idempotency keys for Quarkus — safe retries via the Idempotency-Key header (Stripe / IETF draft).

Correct, idempotent, concurrency-safe double-entry ledger with ISO 20022 payment processing (pain.001 → pacs.008 → pacs.002) and a reconciliation engine. Proves exactly-once under duplicate/concurrent payments.

Idempotency and distributed locks in practice — booking demo with Node.js, MongoDB, Redis, React, Kubernetes

Deterministic idempotency keys and storage adapters for taming duplicate requests across Redis, SQL, MongoDB, and in-memory backends.

A framework-agnosticmiddleware implementing the HTTP Idempotency-Key draft.

A Rack Middleware implementing the idempotency design principle using the Idempotency-Key HTTP header.

Secure banking backend with transactions, ledger system, and idempotency built using Node.js & Express.

Banking ledger backend system built with Node.js, Express, and MongoDB. It features a double-entry accounting system, secure transactions, and idempotency handling.