Node.js FAQ: Top Questions

Error handling in Express.js involves catching errors in synchronous code, middleware, or async functions and passing them to a centralized error-handling middleware.

• Sync Errors: Automatically caught by Express.
• Async Errors: Use next(err) or try/catch.
• Error Middleware: Defined with four parameters ( err, req, res, next ).
• Use Case: Graceful error responses, logging.