Minimal Domain-Driven Design For Nest Js

Domain-driven design (DDD) is important for building software because it helps us understand complex problems better. It gives us a common language to talk about those problems, making it easier for everyone involved to understand each other. DDD also helps us organize our code in a way that makes it easier to work with and change as needed. By breaking down big problems into smaller, more manageable parts, DDD makes it easier to grow our software as our needs change. It also reduces the chance of mistakes and helps us make sure our software does what it’s supposed to do. Ultimately, DDD helps us focus on what matters to the business, so we can deliver valuable solutions more effectively.

Domain-Driven Design Layers

Domain-Driven Design (DDD) typically consists of several layers, each serving a specific purpose in building software that aligns closely with the problem domain. These layers are:

  1. Domain Layer: This layer is the heart of DDD, focusing on the business logic and rules of the application. It contains domain entities, value objects, aggregates, and domain services. The domain layer reflects the core concepts and behaviors of the problem domain, ensuring that the software accurately represents real-world scenarios.

  2. Application Layer: The application layer orchestrates interactions between the domain layer and the infrastructure layer. It contains application services, which define the use cases and coordinate the execution of domain logic. Application services receive requests from the presentation layer, interact with domain objects, and coordinate transactions and security measures.

  3. Infrastructure Layer: The infrastructure layer provides technical concerns such as data access, external services, and communication protocols. It includes repositories for data persistence, external service clients, messaging systems, and other infrastructure-related components. The infrastructure layer is responsible for handling technical details while keeping the domain layer isolated from external dependencies.

Folder Structure For Nest Js Project

In conclusion, Domain-Driven Design (DDD) offers a systematic approach to building software that closely aligns with the complexities of real-world problem domains. By dividing the system into layers — Domain, Application, Infrastructure, and Presentation — DDD enables developers to encapsulate domain logic, coordinate interactions, handle technical concerns, and interface with users or external systems effectively. This layered architecture promotes maintainability, scalability, and adaptability, ultimately leading to the creation of software solutions that accurately reflect business needs and deliver value to stakeholders. DDD encourages a shared understanding of the problem domain among developers and domain experts, fostering clear communication and reducing the risk of misunderstandings. Overall, DDD serves as a powerful methodology for developing software systems that are robust, flexible, and aligned with business objectives.

Template Link: https://github.com/bilaltahseen/domain-driven-boilerplate