elearning/Backend

E-Learning Backend

Backend API for the E-Learning Platform built with Node.js, Express, Prisma, and PostgreSQL.

🚀 Features

• Authentication & Authorization: JWT-based authentication with role-based access control
• Course Management: Create, manage, and publish courses with chapters and lessons
• Multi-Language Support: Thai and English content support
• Quiz System: Interactive quizzes with multiple attempts and score policies
• Progress Tracking: Track student progress and issue certificates
• File Upload: Support for video lessons and attachments (MinIO/S3)
• Caching: Redis integration for improved performance
• Security: Helmet, CORS, rate limiting, and input validation

📋 Prerequisites

• Node.js >= 18.0.0
• PostgreSQL >= 14
• Redis (optional, for caching)
• MinIO or S3 (for file storage)

🛠️ Installation

1. Clone the repository

git clone <repository-url>
cd e-learning/Backend

2. Install dependencies

npm install

3. Setup environment variables

cp .env.example .env
# Edit .env with your configuration

4. Start Docker services (PostgreSQL, Redis, MinIO)

docker compose up -d

5. Run database migrations

npx prisma migrate dev

6. Seed the database

npm run prisma:seed

7. Start development server

npm run dev

The server will start on http://localhost:4000

📁 Project Structure

Backend/
├── prisma/
│   ├── migrations/        # Database migrations
│   ├── schema.prisma      # Database schema
│   └── seed.js           # Database seeding
├── src/
│   ├── config/           # Configuration files
│   │   ├── database.js   # Prisma client
│   │   ├── logger.js     # Winston logger
│   │   └── redis.js      # Redis client
│   ├── controllers/      # Request handlers
│   ├── middleware/       # Express middleware
│   │   ├── auth.js       # Authentication & authorization
│   │   └── errorHandler.js
│   ├── routes/           # Route definitions
│   ├── services/         # Business logic
│   ├── utils/            # Utility functions
│   │   └── jwt.js        # JWT utilities
│   ├── validators/       # Input validation
│   ├── app.js           # Express app setup
│   └── server.js        # Server entry point
├── tests/               # Test files
├── logs/                # Log files
├── .env.example         # Environment variables template
├── package.json
└── README.md

🔑 Environment Variables

See .env.example for all available environment variables.

Key variables:

• DATABASE_URL: PostgreSQL connection string
• JWT_SECRET: Secret key for JWT tokens
• REDIS_URL: Redis connection string
• S3_ENDPOINT: MinIO/S3 endpoint
• CORS_ORIGIN: Allowed CORS origins

🧪 Testing

# Run all tests
npm test

# Run tests in watch mode
npm run test:watch

# Run tests with coverage
npm test -- --coverage

📝 API Documentation

Authentication

• POST /api/auth/register - Register new user
• POST /api/auth/login - Login user
• GET /api/auth/me - Get current user profile
• POST /api/auth/logout - Logout user

Health Check

• GET /health - Server health status

🔐 Default Credentials

After seeding the database, you can use these credentials:

• Admin: admin / admin123
• Instructor: instructor / admin123
• Student: student / admin123

🛠️ Development

# Start dev server with auto-reload
npm run dev

# Run linter
npm run lint

# Format code
npm run format

# Open Prisma Studio (database GUI)
npm run prisma:studio

📦 Database Commands

# Generate Prisma Client
npm run prisma:generate

# Create migration
npx prisma migrate dev --name migration_name

# Apply migrations
npx prisma migrate deploy

# Reset database (development only)
npx prisma migrate reset

# Seed database
npm run prisma:seed

🚀 Production Deployment

1. Set NODE_ENV=production
2. Set strong JWT_SECRET
3. Configure production database
4. Run migrations: npx prisma migrate deploy
5. Start with PM2: pm2 start src/server.js

📚 Resources

• Prisma Documentation
• Express Documentation
• JWT Documentation

📄 License

MIT