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Product Requirements Document - Sample E-Commerce Application

Project Overview

Build a modern e-commerce application with user authentication, product catalog, shopping cart, and checkout functionality.

Phase 1: Project Setup & Core Infrastructure

  • Initialize Node.js project with TypeScript and Express
  • Set up PostgreSQL database with connection pooling
  • Configure environment variables and secrets management
  • Create database migration system using Knex or TypeORM
  • Set up logging with Winston or Pino
  • Configure CORS and security middleware (helmet, rate limiting)

Phase 2: User Authentication & Authorization

  • Create User model with email, password hash, and timestamps
  • Implement bcrypt password hashing utility
  • Build JWT token generation and validation service
  • Create POST /api/auth/register endpoint with validation
  • Create POST /api/auth/login endpoint with JWT response
  • Implement authentication middleware for protected routes
  • Add password reset functionality with email tokens
  • Create user profile endpoints (GET/PUT /api/users/profile)

Phase 3: Product Management

  • Create Product model with name, description, price, image, inventory
  • Build GET /api/products endpoint with pagination and filtering
  • Build GET /api/products/:id endpoint for product details
  • Create POST /api/products endpoint (admin only)
  • Create PUT /api/products/:id endpoint (admin only)
  • Create DELETE /api/products/:id endpoint (admin only)
  • Implement product image upload to S3 or Cloudinary
  • Add product search functionality with full-text search
  • Create product category system with hierarchy

Phase 4: Shopping Cart

  • Create Cart model linking users to products with quantities
  • Build GET /api/cart endpoint to retrieve user's cart
  • Create POST /api/cart/items endpoint to add products to cart
  • Create PUT /api/cart/items/:id endpoint to update quantity
  • Create DELETE /api/cart/items/:id endpoint to remove from cart
  • Implement cart total calculation with tax and shipping
  • Add cart persistence across sessions
  • Create cart expiration logic for abandoned carts

Phase 5: Order & Checkout

  • Create Order model with user, items, status, and payment info
  • Build POST /api/orders endpoint to create order from cart
  • Integrate Stripe payment processing
  • Create GET /api/orders endpoint for user's order history
  • Create GET /api/orders/:id endpoint for order details
  • Implement order status tracking (pending, paid, shipped, delivered)
  • Add order confirmation email with SendGrid or AWS SES
  • Create admin order management endpoints

Phase 6: Frontend - Basic UI

  • Set up React project with Vite or Create React App
  • Configure React Router for navigation
  • Create responsive navigation header component
  • Build login and registration pages with form validation
  • Create product listing page with grid layout
  • Build product detail page with image gallery
  • Implement shopping cart UI with item management
  • Create checkout flow with payment form

Phase 7: Frontend - Advanced Features

  • Add Redux or Zustand for global state management
  • Implement optimistic UI updates for cart operations
  • Create loading states and skeleton screens
  • Add error handling and toast notifications
  • Build user dashboard with order history
  • Create admin panel for product management
  • Implement product search with debouncing
  • Add product filtering and sorting UI

Phase 8: Testing

  • Write unit tests for authentication service
  • Write unit tests for cart calculation logic
  • Create integration tests for auth endpoints
  • Create integration tests for product endpoints
  • Create integration tests for order endpoints
  • Write E2E tests for user registration flow
  • Write E2E tests for checkout flow
  • Set up test database seeding and teardown
  • Achieve 80% code coverage target

Phase 9: Performance & Optimization

  • Add database indexes on frequently queried fields
  • Implement Redis caching for product catalog
  • Add API response caching with cache invalidation
  • Optimize product images (compression, WebP format)
  • Implement lazy loading for product images
  • Add frontend code splitting and lazy routes
  • Optimize bundle size with tree shaking
  • Set up CDN for static assets

Phase 10: DevOps & Deployment

  • Set up CI/CD pipeline with GitHub Actions
  • Configure automated testing in CI pipeline
  • Create Docker containers for backend and frontend
  • Set up Docker Compose for local development
  • Deploy backend to AWS ECS or Heroku
  • Deploy frontend to Vercel or Netlify
  • Configure production database with backups
  • Set up monitoring with Datadog or New Relic
  • Configure error tracking with Sentry
  • Add health check endpoints for monitoring

Phase 11: Documentation

  • Write API documentation with Swagger/OpenAPI
  • Create README with setup instructions
  • Document environment variables and configuration
  • Write deployment guide for production
  • Create user guide with screenshots
  • Document database schema and relationships
  • Add inline code comments for complex logic
  • Create architecture diagram

Phase 12: Security & Compliance

  • Implement CSRF protection
  • Add SQL injection prevention validation
  • Set up XSS protection headers
  • Implement rate limiting per user/IP
  • Add input sanitization for all endpoints
  • Set up HTTPS with SSL certificates
  • Implement secure session management
  • Add PCI compliance for payment processing
  • Create privacy policy and terms of service
  • Implement GDPR data export/deletion endpoints

Success Criteria

  • All endpoints return proper HTTP status codes
  • All tests pass with >80% coverage
  • Page load time <2 seconds
  • API response time <200ms for most endpoints
  • Zero critical security vulnerabilities
  • Mobile-responsive on all screen sizes
  • Successful payment processing end-to-end
  • Deployment pipeline executes in <10 minutes

Technical Stack

Backend:

  • Node.js + TypeScript + Express
  • PostgreSQL with TypeORM or Knex
  • Redis for caching
  • JWT authentication
  • Stripe for payments

Frontend:

  • React + TypeScript
  • Vite for bundling
  • Redux/Zustand for state
  • TailwindCSS for styling
  • React Router for navigation

DevOps:

  • Docker + Docker Compose
  • GitHub Actions for CI/CD
  • AWS ECS or Heroku for backend
  • Vercel or Netlify for frontend
  • Sentry for error tracking

Notes

  • Use semantic versioning for releases
  • Follow conventional commits for git messages
  • Code must pass ESLint and Prettier checks
  • All PRs require review before merge
  • Database migrations must be reversible
  • Maintain changelog for all releases