How do I build a secure REST API with Express.js?

1. authentication (JWT via passport.js), 2. input validation (joi, zod), 3. rate limiting (express-rate-limit), 4. CORS configured, 5. HTTPS/SSL, 6. logging (winston), 7. error handling. Best practice: all at deploy setup.

API versioning – /v1/users vs. header-based?

URL versioning (/v1, /v2): simpler, explicit. Header-based: cleaner, but more complex. Recommendation: URL for public APIs, headers for internal. Minimize breaking changes via backwards-compatibility.

Rate limiting & DDoS protection for APIs?

Rate limit: 100 requests/minute per IP. Cloudflare WAF in front for larger attacks. Redis as storage for rate-limit counters. Throttling: warn first, then block. Monitoring: grafana + prometheus.

Database connection pooling – why important?

Without pooling: each request = new DB connection (expensive). With pooling (e.g., PgBouncer): 10 connections for 1000 users. Massive performance improvement. Config: min=5, max=20 (fits on VPS).

API caching – Redis, Memcached or HTTP cache?

Redis: flexible, fast, ideal for complex caching logic. Memcached: simpler, for simple key-value. HTTP cache (ETag, Last-Modified): browser-friendly. Recommendation: combine Redis + HTTP cache.

GraphQL query costs – how do I prevent DoS attacks?

Query cost analysis: complex queries cost more. Query depth limit (max 10), query timeout (5s). Authentication mandatory. Rate limiting per user. Tool: Apollo Server with plugin system.

API monitoring & error tracking – Sentry, DataDog?

Sentry: free (self-hosted), error tracking. DataDog: professional, expensive. Alternative: ELK stack + Prometheus. Setup: log errors, alert on outages, trace for latency issues.

WebSockets for real-time APIs – how do I implement this?

WebSockets: bidirectional, low-latency. Libraries: Socket.io (easy, with fallbacks), ws (lightweight). Broadcasting: Redis pub/sub for multi-server. Scaling: load balancer with session affinity.

Automate API tests – Jest, Postman or tools?

Jest: unit tests for API logic. Supertest: integration tests for endpoints. Postman/Bruno: manual testing & API docs. Best practice: CI/CD pipeline with automated tests before deploy.

Quick answer: REST: simpler, standard, caching easy. GraphQL: flexible, exactly what you need, query-optimized. For beginners: REST. For complex data: GraphQL. Hybrid: REST APIs + GraphQL layer on top.

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