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- Create centralized env validation using Zod - Validate all environment variables at startup - Provide helpful error messages for missing/invalid vars - Update all files to use validated env instead of process.env - Add .env.example file with documentation - Improve type safety with TypeScript inference
- Replace console.log with Winston structured logging - Add file-based logging with rotation (combined.log, error.log) - Add exception and rejection handlers - Implement request logging middleware with structured data - Update error handler to use structured logging - Add different log formats for dev (colorized) and prod (JSON) - Configure log levels based on environment
- Generate unique request ID for each request - Support X-Request-ID header for distributed tracing - Add request ID to response headers - Include request ID in logs for better traceability - Extend Express Request type with requestId property
- Configure comprehensive security headers - Add Content Security Policy (CSP) - Enable HSTS for HTTPS enforcement - Prevent clickjacking with frameguard - Add XSS protection and MIME type sniffing prevention - Configure permissions policy for browser features - Set referrer policy and other security headers
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