Next.js 15 Tutorial - 25 - Error Handling

Error Handling in React Applications

Introduction to Error Handling

• The discussion begins with the importance of error handling in applications, specifically through a file named error.tsx.

• A realistic scenario is introduced where network requests may fail, prompting the need for effective error management.

Simulating an Error Scenario

• A function is created to generate random integers; if it returns one, an error is thrown with the message "Error loading review."

• In development mode, refreshing the page can lead to an unhandled runtime error displaying this message.

Production Behavior and User Experience

• When tested in production using npm run build, a generic application error appears instead of a helpful message.

• The issue highlighted is that errors in deeply nested components can disrupt the entire application experience.

Implementing Error Boundaries

• To improve user experience, an error.tsx component is created as an error boundary around the page.tsx file.

• This component allows for graceful handling of errors without affecting other parts of the application; only the affected component displays an error message.

Enhancing Error Messages

• The default text "Error in review ID" is replaced with a more informative message using error.message, which provides context when issues arise.

Benefits of Using Error Boundaries

• The app router automatically wraps route segments and their children within a React error boundary, isolating errors effectively.