Feature Based Clean Architecture. Part 4: FBCA: Formalizing Responsibility Boundaries in a NestJS Module

Short summary

Feature-Based Clean Architecture (FBCA) applies Clean Architecture principles within NestJS features by organizing code into domain, use-case, infrastructure, and presentation layers with enforced dependency direction. This structural constraint prevents architectural degradation and circular dependencies that plague unstructured feature-based approaches. Dependencies flow strictly inward toward domain logic, isolating business rules from infrastructure and HTTP details.

• •Combines feature-based organization with Clean Architecture layering (domain → use-case → infrastructure → presentation)
• •Enforces unidirectional dependency flow inward toward domain logic to prevent circular dependencies and tech debt
• •Provides concrete NestJS patterns with TypeScript examples for structuring modules that stay maintainable as codebases grow

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