API Security Hardening Protect REST APIs against common vulnerabilities with multiple security layers. Security Middleware Stack (Express) Input Validation Security Headers Security Checklist - [ ] HTTPS everywhere - [ ] Authentication on all protected routes - [ ] Input validation and sanitization - [ ] Rate limiting enabled - [ ] Security headers configured - [ ] CORS restricted to allowed origins - [ ] No stack traces in production errors - [ ] Audit logging enabled - [ ] Dependencies regularly updated Additional Implementations See references/python-nginx.md for: - Python FastAPI security…