Leaderboard Deploy agents

This review focuses on ensuring proper error handling in Next.js API routes. Key principles:

  1. Validate incoming request data before processing to catch and handle errors early.
  2. Use a consistent error response structure, including appropriate HTTP status codes.
  3. Sanitize error messages to avoid exposing sensitive information.
  4. Handle errors securely using try/catch blocks and avoid leaking internal details.
  5. Return only necessary error details in responses to provide useful feedback to clients.

Example of correct error handling in a Next.js API route:

export async function POST(request: Request) {
  try {
    // 1. Validate incoming data
    const data = await request.json();
    const validationResult = await validateInputs(data);
    
    if (!validationResult.success) {
      return Response.json(
        { 
          error: 'Validation failed',
          message: validationResult.message 
        }, 
        { status: 400 }
      );
    }

    // 2. Process the request
    const result = await processData(data);
    
    // 3. Return success response
    return Response.json({ data: result });
    
  } catch (error) {
    // 4. Handle errors securely
    const safeMessage = error instanceof Error 
      ? sanitizeErrorMessage(error.message)  // Remove sensitive details
      : 'An unexpected error occurred';
      
    return Response.json(
      { 
        error: true,
        message: safeMessage
      },
      { status: 500 }
    );
  }
}

Developers should follow these guidelines to ensure robust and secure error handling in their Next.js API implementations.