hono-problem-details

RFC 9457 Problem Details middleware for Hono that standardizes error responses across routes. Current stable version is 0.5.0, released monthly with semantic versioning. Key differentiators: official Hono integrations for Zod, Valibot, Zod-OpenAPI, and Standard Schema; auto-instance population; localization support; zero runtime dependencies beyond Hono; edge-worker compatible. Alternatives require manual error shaping or lack standard compliance.