A new open-source library tackles the chaotic state of error handling in full-stack apps. It establishes a shared error contract between frontend and backend, using a predictable structure with codes, messages, and trace IDs. This approach decouples layers, ensuring consistency without tight code dependencies.

The system treats errors as structured data, not exceptions. The backend normalizes failures—from databases to APIs—into a single object. The frontend then decides user-facing messaging, localization, and UI presentation. This separation of concerns allows for cleaner APIs, better debugging, and a shared mental model across teams.

Adoption is progressive; you can use backend utilities, frontend hooks, or both. The library is built for modern stacks: React 18/19, Next.js, Node.js, and TypeScript. It provides hooks like `useAPIError()` and wraps the app in a single React error boundary. The goal is to transform error handling from fragile glue code into robust infrastructure.