📰 Dev.to · Young Gao

Role-Based Access Control (RBAC) in Node.js: Beyond Simple Admin Checks Most apps start...

A hands-on guide to building Model Context Protocol servers that give AI agents superpowers. Real code, production patterns, and lessons learned.

Cache invalidation is one of the two hard problems in CS. Learn write-through, write-behind, cache-aside patterns and when to use each for optimal hit rates.

Your frontend fetch call fails with 'No Access-Control-Allow-Origin'. Understand CORS preflight, allowed headers, credentials, and how to configure it properly.

Fixed-window rate limiting breaks at window boundaries. Learn sliding window counters, token buckets, and distributed rate limiting with Redis for production AP

Two services update the same resource simultaneously. Data corrupts silently. Learn distributed locking with Redis, PostgreSQL advisory locks, and fencing token

Feature flags let you deploy without releasing. Build a runtime toggle system in TypeScript with percentage rollouts, user targeting, and A/B testing support.

Scaling WebSocket connections beyond a single server. Learn sticky sessions, Redis pub/sub fan-out, connection state management, and horizontal scaling patterns

Streaming LLM responses, tool use integration, and context management patterns for TypeScript backends. Build AI-ready APIs that handle real-world LLM interacti

When Redis goes down at 3 AM, does your entire backend crash? Learn circuit breakers, fallback chains, and bulkhead patterns to keep your services running when

JWTs, API keys, and OAuth2 each solve different auth problems. Learn when to use which, common security pitfalls, and production-ready implementations in TypeSc

Database-per-tenant gives isolation but costs more. Shared schema is cheaper but leaky. Learn the trade-offs and implement multi-tenant architecture that scales

Your database shows current state but can't tell you how you got there. Learn event sourcing patterns that give you a complete audit trail, time travel, and rep

Most teams reach for Kong before understanding what an API gateway does. Build one from scratch with JWT auth, per-client rate limits, and request routing in No

You deploy a migration. The site goes down for 7 minutes. Learn zero-downtime schema changes with expand-contract pattern, online DDL, and safe rollback strateg

HTTP calls between services create tight coupling. Learn pub/sub patterns with Redis Streams, NATS JetStream, and when to use each for event-driven architecture

Here's the article body markdown: Your API returns 200. The user sees "success." Behind the...

Kubernetes kills your pod but traffic still routes to it. Configure liveness, readiness, and startup probes correctly to prevent downtime during deployments.

RAG isn't dead — you're just doing it wrong. Learn hybrid search, reranking, contextual chunking, and query decomposition patterns that actually work in product

LangGraph tutorial that goes beyond chat demos. Build production AI agents with state machines, human-in-the-loop, tool orchestration, and error recovery.

Your API is slow because Node.js is single-threaded? Not anymore. Learn when and how to use Worker Threads for CPU-intensive tasks like hashing, image processin

Building a message queue consumer that doesn't lose messages or crash under load. Covers graceful shutdown, dead letter queues, backpressure, and exactly-once p

Naive retries cause thundering herds. Learn exponential backoff with jitter, dead letter queues, and retry budgets that protect your services under failure.

Your .env file is in git. Your staging secrets are in a Slack channel. Learn production-grade environment variable management with validation, type safety, and