I'll proceed with building the application. You can add the environment variables later. Let me start with the MongoDB setup and authentication system.

I have the UI components available. Now let me start building. First, I'll update the package.json with MongoDB and auth dependencies, then create the database models, API routes, and frontend components.

Now let me create the database connection, models, and all the necessary files:

Now let me create the authentication utilities and API routes:

Now let me create the API routes for categories, expenses, budgets, and profile:

Now let me create the admin API routes:

Now let me create the frontend components. First, I'll create the auth context and components:

Now let me create the dashboard layout with sidebar navigation:

I have the sidebar component. Now let me create the dashboard layout and components:

Now let me create the expenses management page with CRUD functionality:

Now let me create the Categories and Budgets pages:

Now let me create the reports page with charts and export functionality:

Now let me create the profile management page:

Now let me create the admin dashboard and user management pages:

Now let me update the main layout.tsx to include the AuthProvider and Toaster, and update the main page to redirect to the dashboard:

Now let me mark all tasks as done:

I've successfully built your complete expense management application. Here's a summary of what was created:

Backend (API Routes):

• Authentication: Register, Login, Logout, Session management with JWT tokens
• Expenses: Full CRUD with filtering, pagination, and search
• Categories: Custom categories with colors
• Budgets: Monthly budget limits per category with spending tracking
• Profile: View and update profile, change password
• Stats: Dashboard statistics and charts data
• Admin: User management, platform statistics, user detail views

Frontend Pages:

• Landing page with feature highlights
• Login and Registration forms
• Dashboard with stats cards and charts
• Expenses management with filtering and CRUD
• Categories management with custom colors
• Budgets with progress tracking
• Reports with multiple chart types and CSV/PDF export
• Profile management with password change
• Admin dashboard with platform analytics
• Admin user management with detailed user views

Key Features:

• First registered user automatically becomes admin
• JWT-based authentication with HTTP-only cookies
• Role-based access control for admin routes
• Responsive sidebar navigation
• Visual charts using Recharts (pie, bar, line charts)
• Export to CSV and PDF

To get started, you need to:

1. Add your MONGODB_URI environment variable (from MongoDB Atlas)
2. Add a JWT_SECRET environment variable (any random string for production)

Let me also check the login API and session API to understand the flow, and set up your MongoDB URI:

I can see the issue. The API uses cookies() from next/headers but the fetch request from the client doesn't include credentials. Let me first set up your MongoDB URI and then fix the fetch credentials issue: