error-handling

To standardize API error handling in Express.js, implement centralized error handler middleware that catches application-specific errors and returns consistent, structured response bodies with status codes and tracing identifiers like requestId.

The best way to catch asynchronous errors in TypeScript Express routes is using an async handler wrapper utility, which automatically forwards caught exceptions to the centralized error-handling middleware for consistent formatting.

To format validation errors for consistent API responses, define custom error classes like ValidationError and process them through centralized middleware to output structured error bodies with standardized fields.

Yes, you can use custom error classes to manage backend application errors by defining a hierarchy such as NotFoundError and UnauthorizedError, allowing the centralized middleware to map them to correct HTTP status codes.

Centralized error handling middleware is needed in backend applications to ensure predictable API responses, improve debugging capabilities with request tracing, and prevent unhandled exceptions from crashing the server.

Yes, this error handling approach works without external dependencies, utilizing only TypeScript and Express.js native patterns like custom error classes and middleware wrappers to standardize backend error management.