N-Layers (also known as N-Tiers) architecture.

• src/
  • entities/
    • User.js
    • Product.js
  • factories/
    • UserFactory.js
    • ProductFactory.js
  • repositories/
    • UserRepository.js
    • ProductRepository.js
  • routes/
    • UserRoute.js
    • ProductRoute.js
  • services/
    • UserService.js
    • ProductService.js
  • util/
    • Validation.js
    • ErrorHandling.js
  • handler/
    • RouteHandler.js
• tests/
  • integration/
    • UserIntegrationTest.js
    • ProductIntegrationTest.js