Let's start with the backend implementation:

This implementation includes:

Backend (NestJS):

1. User registration with validation
2. Password hashing using Argon2
3. JWT-based authentication
4. Protected routes using Guards
5. Logout endpoint
6. TypeORM integration for database management

Frontend (Next.js):

1. Registration form with validation using Zod
2. Login form with validation
3. Protected routes using middleware
4. Token management (storage, validation, removal)
5. Dashboard with logout functionality
6. Form validation using react-hook-form
7. Responsive UI using Tailwind CSS and shadcn/ui components

To use this system:

1. Set up your NestJS backend:

2. Set up your Next.js frontend:

3. Create a .env file in your backend project:

4. Make sure to update the API URLs in the frontend code to match your backend URL.

The system includes all necessary security features:

• Password hashing with Argon2
• JWT token-based authentication
• Form validation on both frontend and backend
• Protected routes
• Secure session management
• CORS protection
• TypeORM for safe database interactions