Splitwise Pro - Java Full Stack Edition 🚀

Splitwise Pro is a complete, full-stack bill-splitting application designed to help users track shared expenses, manage groups, and calculate exactly "who owes who."

Built with a robust Java/Spring Boot backend and a modern React frontend, this project demonstrates complex mathematical calculations, secure authentication, and a scalable database architecture.

🌟 Features

• User Authentication: Secure JWT-based Login and Registration.
• Group Management: Create groups and invite friends.
• Expense Splitting Engine: Split bills by:
  • EQUAL (split evenly among everyone)
  • EXACT (specify exact amounts per person)
  • PERCENTAGE (split by exact percentages)
• Real-Time Settlement Dashboard: See your exact net balance, who owes you, and who you owe.
• RESTful API: fully documented with Swagger UI.

🛠️ Tech Stack

Frontend:

• React.js (Create React App)
• Tailwind CSS
• Axios for API requests

Backend:

• Java 17
• Spring Boot 3
• Spring Security (JWT)
• PostgreSQL (Production) / H2 (Development)
• Hibernate / JPA

🚀 How to Run Locally

1. Start the Backend

The backend runs on http://localhost:8080. It uses an in-memory H2 database for local development, meaning no database setup is required!

cd backend
mvn clean spring-boot:run

You can access the Swagger UI at http://localhost:8080/swagger-ui/index.html

2. Start the Frontend

The frontend runs on http://localhost:3000.

cd frontend
npm install
npm start

🌐 Deployment Ready

This project is configured with a Dockerfile for easy backend deployment on Render/Railway and a vercel.json for frontend deployment on Vercel.