Expense Splitter Backend

A production-ready backend API for splitting group expenses, inspired by Splitwise.
Supports authentication, group management, expense tracking, and balance calculation.

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Live Demo

Backend URL:
https://expensespliter.onrender.com

Swagger API Docs:
https://expensespliter.onrender.com/api-docs

Full-stack live URL: https://expense-frontend-peach-three.vercel.app

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Features

• User authentication using JWT
• Create and manage groups
• Add shared expenses within groups
• Automatic equal expense splitting
• Group-wise balance calculation
• Secure protected routes with middleware
• Interactive API documentation using Swagger

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Tech Stack

• Node.js
• Express.js
• PostgreSQL
• Sequelize ORM
• JWT (JSON Web Tokens)
• Swagger (OpenAPI)
• Deployed on Render

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Authentication Flow

1. User registers or logs in
2. Server issues a JWT
3. Client sends JWT in request headers
4. Protected routes are validated via middleware

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Setup Locally

git clone https://github.com/Eswarpulaparthi/expenseSpliter
cd expenseSpliter
npm install
npm start