Domain-Oriented API Design
As systems grow, organizing code only by HTTP routes may become insufficient.
Domain-oriented architecture groups functionality around business capabilities such as billing, identity, orders, inventory, or notifications.
The API layer becomes an adapter around application use cases rather than the center of the domain model.
This approach helps when the same business rules need to be triggered by HTTP APIs, queues, scheduled jobs, and event consumers.
Key Takeaways
- HTTP should not own business rules.
- Business operations can be invoked through multiple transport mechanisms.
- Domain boundaries become increasingly important as systems grow.