error-handler

Centralized error handling in a TypeScript API is implemented by creating a shared AppError hierarchy with typed error classes and routing them through a single global error handler middleware to format uniform responses.

A typed Result pattern in API error handling is a mechanism that represents failures as return values instead of throwing exceptions, enabling safer failure paths and easier testing in server-side JavaScript codebases.

You can standardize HTTP error responses by defining typed error classes like NotFoundError and ValidationError that carry dedicated HTTP status codes, then passing them to a global error handling middleware.

Migrating existing try/catch blocks involves replacing generic exception catching with typed AppError instances and utilizing the optional Result pattern to handle failure paths without throwing.

Yes, this typed error system supports unauthorized errors in JavaScript routes by using a dedicated UnauthorizedError class that integrates directly with the global middleware to return consistent HTTP status codes.