💸 Wallet - Expense Tracker (React Native + Express)

A full-stack mobile application for tracking income and expenses, built with React Native on the frontend and Express + PostgreSQL on the backend. Designed to run seamlessly on both iOS and Android, this project demonstrates modern authentication, cloud storage, and smooth user experience.

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🚀 Key Features

• 🔐 Secure authentication with email verification (Clerk)
• 📝 Simple signup & login flows using 6-digit email codes
• 📊 Home screen showing balance and transaction history
• ➕ Add income or expense transactions with ease
• 🔄 Pull-to-refresh for real-time updates
• 🗑️ Delete transactions to keep records accurate
• 🚪 Logout functionality with navigation reset

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🛠️ Tech Stack

Frontend

• React Native + Expo
• React Navigation for routing
• State management with hooks

Backend

• Express.js API
• PostgreSQL (Neon cloud database)
• Redis for rate limiting
• Clerk for authentication

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📚 Learning Outcomes

Working with this project helps you understand:

• Building and deploying a REST API with Express + PostgreSQL
• Implementing authentication and email verification
• Structuring a full-stack mobile app with React Native
• Managing navigation and state in mobile environments
• Deploying backend and frontend with cloud-based tools

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⚙️ Environment Setup

Backend (/backend)

PORT=5001
NODE_ENV=development
CLERK_PUBLISHABLE_KEY=<your_clerk_publishable_key>
CLERK_SECRET_KEY=<your_clerk_secret_key>
DATABASE_URL=<your_neon_postgres_connection_url>
REDIS_URL=<your_redis_connection_url>

⚙️ Backend (/backend)

EXPO_PUBLIC_CLERK_PUBLISHABLE_KEY=<your_clerk_key>

⚙️ Run the backend

cd backend
npm install
npm run dev

📱 Run the mobile

cd mobile
npm install
npx expo start