Idempotency Keys: How to Make API Retries Safe
How idempotency keys stop double charges when clients retry: the design, a PostgreSQL and Node.js implementation, edge cases and idempotent consumers.
Node.js articles
4 articles about Node.js, written from hands-on experience building and scaling production systems.
- 6 min
- 7 min
Model Context Protocol (MCP) Explained: Build Your First MCP Server
What the Model Context Protocol is, how hosts, clients and servers fit together, and how to build a TypeScript MCP server with tools and resources.
- 5 min
Scaling Node.js: From Single Server to Handling Millions of Requests
Scale Node.js from one server to millions of requests: clustering, horizontal scaling, load balancing, Redis caching, worker threads and monitoring.
- 5 min
Why Your API Is Slow (And How to Fix It)
Diagnose and fix slow APIs: N+1 queries, missing indexes, payload bloat, connection pool exhaustion and caching, with Node.js and SQL examples.
Other topics
Backend 12System Design 11Performance 7Distributed Systems 6Architecture 4AI Engineering 3LLM 3Redis 3Tutorial 3API Design 2Career 2CTO 2Engineering Management 2Leadership 2PostgreSQL 2Startups 2Web Development 2Caching 1CDC 1Cloud 1Consulting 1Databases 1DevOps 1Docker 1Elasticsearch 1Frontend 1Interviews 1JavaScript 1Kafka 1MCP 1Microservices 1Mobile 1Next.js 1Personal Branding 1Production 1RabbitMQ 1RAG 1React 1Search 1SEO 1SQL 1TypeScript 1