Fixes & Improvements for Express.js Routing and Error Handling

Project Goal:

Refactor the Express.js backend to ensure clear route organization and implement consistent error handling across the application.

Key Fixes:

Modular Route Structure

Split monolithic route file into multiple modules based on feature domains (e.g., authRoutes, userRoutes, reportRoutes)

Created a central router/index.js to load all route modules in a clean and scalable way

Error Handling Middleware

Implemented centralized error-handling middleware using app.use(errorHandler)

Now all thrown errors and async failures return standardized JSON responses with correct HTTP status codes

Validation Improvements

Integrated express-validator to validate input data (e.g., email, password length) directly in route definitions

Added automatic error return if validation fails, improving frontend-backend integration

Authorization Middleware

Improved the structure of authMiddleware and added role-based access control logic

Ensures that protected routes are only accessible to authorized users (e.g., admin)

Improved Async Flow

Wrapped all async route handlers in try-catch blocks or passed through custom asyncHandler() utility to prevent unhandled promise rejections

Logging and Debugging

Added request logging and clearer debug messages for easier monitoring and faster debugging

Results:

The backend is now more maintainable, scalable, and secure

All routes are cleanly separated, and errors are consistent and informative

Ready for production deployment or further API expansion

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