Go Error Handling Patterns for Production APIs: Beyond Basic Error Returns

Production APIs demand bulletproof error handling. While Go's explicit error handling is a strength, most developers stop at basic if err != nil checks. That's not enough when your API serves thousands of requests per minute and debugging becomes a nightmare without proper error context. This guide covers advanced error handling patterns that separate production-ready Go APIs from hobby projects. We'll explore structured errors, proper error wrapping, and observability integration that actually helps you sleep at night. The Problem with Basic Error Returns Go's standard error handling encourages explicit checks, but basic implementations fall short in production environments. Consider this typical API handler: func ( h * UserHandler ) GetUser ( w http . ResponseWriter , r * http . Request ) { userID := r . URL . Query () . Get ( "id" ) user , err := h . userService . GetByID ( userID ) if err != nil { http . Error ( w , err . Error (), http . StatusInternalServerError ) return } json .