🧾 Expense Tracker API

Robust and scalable backend for the Expense Tracker Web App — powering user authentication, expense management, advisor scheduling, real-time communication, secure payments, and media uploads. Built with TypeScript, Node.js, Express, and MongoDB, following modular and maintainable architecture patterns.

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🚀 Features

• 🔐 JWT & Google OAuth Authentication
• 👥 Role-based access control (User, Advisor, Admin)
• 📊 Expense tracking & category filtering
• 📅 Advisor slot creation, updates, and booking
• 💬 Real-time chat with Socket.IO
• 📹 Video calls powered by ZegoCloud (frontend integration)
• ☁️ File uploads with Cloudinary & AWS S3 using Multer
• 💳 Stripe Integration for secure payments
• 📩 Email service with Nodemailer
• 📦 Scalable, service-repository architecture
• 🧪 Validation using Joi
• ⚙️ Environment-based configuration for secure dev/prod usage

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🧱 Tech Stack

⚙️ Backend

• Node.js
• Express.js
• TypeScript
• MongoDB + Mongoose
• Joi
• Socket.IO
• Stripe
• ZegoCloud UIKit
• Multer
• Cloudinary
• Nodemailer

🧱 Architecture

• Layered structure: Controller → Service → Repository (Repository architecture)
• Separation of concerns for maintainability & testing

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🧪 Development

Prerequisites

• Node.js ≥ 18
• MongoDB (local or Atlas)
• Cloudinary keys
• Stripe secret key
• Google OAuth client ID & secret

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📦 Setup & Run

# Clone the repo
git clone https://github.com/DilfaThayyil/ExpenX-server.git

cd ExpenX-server

# Install dependencies
npm install

# Run the server (dev mode with nodemon)
npm run dev