Expense Tracking and Budgeting API

A comprehensive expense management system built with NestJS and TypeORM, featuring robust authentication, role-based access control, and intelligent data aggregation.

Key Features

• JWT-based Authentication: Secure user authentication and authorization system
• Role-based Access Control: Different permission levels for users and administrators
• Data Aggregation: Intelligent expense categorization and spending analysis
• Scheduled Summaries: Automated expense reports and budget notifications
• RESTful API Design: Clean, well-documented API endpoints
• Swagger Documentation: Interactive API documentation for easy integration

Technical Implementation

The application follows a modular architecture with clean separation of concerns:

• Authentication Module: JWT token management and user session handling
• Expense Module: CRUD operations for expense management
• Budget Module: Budget creation, tracking, and alerts
• Reporting Module: Data aggregation and summary generation
• User Management: Role-based user administration

Technology Stack

• Backend Framework: NestJS with TypeScript
• Database: PostgreSQL with TypeORM
• Authentication: JWT tokens with role-based access
• Documentation: Swagger/OpenAPI specification
• Validation: Class-validator for input validation
• Testing: Jest for unit and integration tests

This project demonstrates proficiency in building scalable backend systems with modern TypeScript frameworks and database design patterns.