Error Handling Standardizer Build consistent, debuggable error handling across the application. Error Taxonomy Error Handler Middleware Structured Logging Safe Client Messages Async Error Handling Best Practices - Use custom error classes - Distinguish operational vs programming errors - Log all errors with context - Never expose stack traces to clients - Include trace IDs for debugging - Monitor error rates by type - Set up alerting for critical errors Output Checklist - [ ] Custom error classes defined - [ ] Error handler middleware - [ ] HTTP status code mapping - [ ] Structured logging se…