Clean Architecture in Frontend: Best Practices

Frontend projects rarely become unmaintainable overnight: they degrade every time a component knows too much. Clean Architecture puts one simple rule on the table: dependencies point inward, toward the business logic, never outward.

The three layers you actually need

For most apps, three layers are enough: interface (components and pages), domain (entities, validation, and rules), and infrastructure (HTTP calls, storage, SDKs). The interface may import from the domain, but the domain never imports from the interface or infrastructure.

The dependency rule in practice

If your contact form imports the HTTP client directly, the rule is broken: switching providers forces you to touch the UI. Define a port (a function or interface) in the domain and implement the adapter in infrastructure. Testing the logic becomes trivial because it no longer depends on the network.

Signs you need it

You need it when changing an API breaks screens that should be unaffected, when you cannot test a validation without mounting half the component tree, or when two teams keep colliding on the same file. Start by separating a single module: validating and submitting a form is a perfect first step.