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Proper Error Handling in Next.js API Routes

vercel/next.js
Based on 4 comments
JavaScript

This review focuses on ensuring proper error handling in Next.js API routes. Key principles include validating incoming request data, using consistent error response structures, and sanitizing error messages.

Next.js JavaScript

Reviewer Prompt

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.

4
Comments Analyzed
JavaScript
Primary Language
Next.js
Category

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