comparing Domain-Driven Design (DDD) and Clean Architecture

main difference between domain-driven design and clean architecture is we are seperating business login, infrastructure and presentation layer for individual module in domain-driven design(DDD).

where seperating business login, infrastructure and presentation layer onces for all module in clean architecture.

Here’s a simplified folder structure comparing Domain-Driven Design (DDD) and Clean Architecture, ensuring clarity and scalability while reducing unnecessary depth.

let take an example for creating folder structure for user and blog module...

Domain-Driven Design (DDD)

src/
├── modules/                    # Feature-based modules
│   ├── user/                   # User module
│   │   ├── application/        # Use cases (business logic)
│   │   │   ├── create-user.usecase.ts
│   │   │   └── update-user.usecase.ts
│   │   ├── domain/             # Core business logic
│   │   │   ├── user.entity.ts
│   │   │   ├── user.repository.ts
│   │   │   └── user.validator.ts
│   │   ├── infrastructure/     # Data access and persistence
│   │   │   ├── user.repository.impl.ts
│   │   │   └── prisma.service.ts
│   │   ├── interfaces/         # Controllers, APIs, and DTOs
│   │   │   ├── user.controller.ts
│   │   │   ├── create-user.dto.ts
│   │   │   └── update-user.dto.ts
│   │   └── user.module.ts      # Module setup
│   ├── blog/                   # Blog module
│   │   ├── application/
│   │   ├── domain/
│   │   ├── infrastructure/
│   │   ├── interfaces/
│   │   └── blog.module.ts
├── shared/                     # Shared utilities and services
│   ├── exceptions/
│   │   └── custom-error.ts
│   ├── utils/
│   │   └── logger.service.ts
├── main.ts                     # Entry point
└── app.module.ts               # Root application module

Clean Architecture

src/
├── core/                       # Core application logic
│   ├── usecases/               # Application use cases
│   │   ├── create-user.usecase.ts
│   │   ├── update-user.usecase.ts
│   │   ├── create-blog.usecase.ts
│   │   └── update-blog.usecase.ts
│   ├── entities/               # Domain models/entities
│   │   ├── user.entity.ts
│   │   ├── blog.entity.ts
│   │   └── index.ts
│   ├── repositories/           # Repository interfaces
│   │   ├── user.repository.ts
│   │   ├── blog.repository.ts
│   │   └── index.ts
│   └── validators/             # Domain-level validations
│       ├── user.validator.ts
│       ├── blog.validator.ts
│       └── index.ts
├── adapters/                   # Adapters for data and frameworks
│   ├── database/               # Database layer
│   │   ├── prisma/
│   │   │   ├── schema.prisma
│   │   │   ├── prisma.service.ts
│   │   │   └── user.repository.impl.ts
│   │   └── blog.repository.impl.ts
│   └── controllers/            # Controllers (API endpoints)
│       ├── user.controller.ts
│       ├── blog.controller.ts
│       └── index.ts
├── config/                     # Configuration files
│   └── app.config.ts
├── shared/                     # Shared utilities
│   ├── exceptions/
│   │   └── custom-error.ts
│   ├── utils/
│   │   └── logger.service.ts
│   └── index.ts
├── main.ts                     # Entry point
└── app.module.ts               # Root application module

Choose DDD if the application is domain-complex and feature-based, or Clean Architecture if you want to prioritize clear separation of layers. Let me know which one resonates!

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