RECAPcha is a full-stack web app that helps students convert their notes into quizzes for more effective studying. Write or upload your notes, and Recapcha will intelligently create quiz questions to test your memory and reinforce learning.

• 📝 Save and manage plain text notes
• 🧠 Automatically generate quizzes based on notes
• 🔐 User authentication (Register / Login)
• 📎 Associate quizzes with their original notes
• ⏬ Download .txt notes or .json quizzes
• 🧑‍💻 Built with MERN Stack (MongoDB, Express, React Native, Node.js)

Recapcha/
├── client/             # React Native frontend
│   ├── screens/        # App screens (Home, Login, Register, etc.)
│   ├── components/     # Shared UI components
│   ├── types/          # TypeScript types
│   └── ...             # Additional client logic
├── server/             # Node.js + Express backend
│   ├── models/         # Mongoose models (User, Note, Quiz)
│   ├── routes/         # API endpoints
│   └── app.js          # Server entry point
├── .env                # Environment variables
└── README.md           # Project documentation

• Node.js (v18+ recommended)
• MongoDB (local or Atlas)
• Expo CLI: npm install -g expo-cli

cd server
npm install
npm run dev

Create a .env file inside the /server folder:

MONGO_URI=mongodb://localhost:27017/recapcha
PORT=5050

cd client
npm install
npx expo start

• Upon login, the user receives a simple token (user ID)
• This token is stored in localStorage on the device
• It is sent in the Authorization: Bearer <token> header for all secured requests

POST   /api/auth/register     # Register new user
POST   /api/auth/login        # Login and get token
GET    /api/auth/user/me      # Get current logged-in user (via token)

POST   /api/notes             # Create new note (requires token)

POST   /api/quizzes           # Create new quiz associated with a note (requires token)

{
  uuid: string;
  txt: string;
  createdAt: Date;
}

{
  q: string;
  a: {
    a1: boolean;
    a2: boolean;
    a3: boolean;
    a4: boolean;
  };
  note: string;       // references note UUID
  user: string;       // user UUID
  createdAt: Date;
}

1. User creates a note → Stored in backend and linked to user
2. User generates a quiz → Tied to the specific note
3. Both are stored and retrievable per user
4. Downloads available as .txt and .json

• Notes and quizzes are embedded arrays in the User schema
• Quizzes reference notes via UUID (fastest for embedded schema)
• Authentication is simplified with user ID tokens

This project is licensed under the MIT License