Layered web app package diagram
A layered web application package diagram makes the responsibilities of each architectural layer easy to inspect. Routes handle delivery, application services coordinate use cases, domain classes express business concepts, and infrastructure adapters connect to external systems. Dependencies reveal whether a route reaches into data access or whether a service is doing too much. This is a useful design artifact for a small web service because it stays at the module level and can change as the architecture evolves.
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Scenario
A web team explains a layered architecture for order handling.
Key decisions
- Keep routes thin: Route packages invoke application services.
- Protect domain logic: Business objects remain independent of delivery details.
- Contain adapters: Persistence and email sit in infrastructure.
- Show direction: Dependencies should point inward where possible.
When to reuse this
Use to review module boundaries and communication paths in a web application.
Frequently asked questions
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