A full-stack application with React Native Expo frontend and Node.js TypeScript backend.

├── backend/          # Node.js TypeScript backend
│   ├── src/
│   │   └── index.ts  # Main server file
│   └── package.json
├── mobile/           # React Native Expo app
│   ├── App.tsx       # Main app component
│   └── package.json
└── package.json      # Root package.json with convenience scripts

• Node.js (v16 or higher)
• npm
• Expo CLI (for mobile development)

# Install all dependencies
npm run install:all

1. Create a new project in CDP Portal. https://portal.cdp.coinbase.com/

2. Go to API Keys Tab and create new API Key.

3. Create .env file in the /backend directory and copy content from .env.example

4. Paste your API Keys in the .env file.

# Development mode (with hot reload)
npm run backend

# Or manually:
cd backend && npm run dev

The backend will start on http://localhost:3000

Available endpoints:

• GET /health - Health check

# Start Expo development server
npm run mobile

# Or manually:
cd mobile && npm start

This will open the Expo development tools in your browser. You can then:

• Scan the QR code with Expo Go app on your phone
  • If choosing to run on the phone, then make sure to use your machine IP address in the frontend code so that your phone can make requests to your locally running backend. Steps:
  1. Run this to get your IP address: ipconfig getifaddr en0
  2. Replace http://localhost:3000 with your IP address in the apiClient.ts file. i.e. http://11.211.4.85:3000
• Press i to open iOS simulator
• Press a to open Android emulator
• Press w to open in web browser