React Project Architecture Guide
Structure React applications by feature, keep dependencies clear, and choose practical boundaries that make growing codebases easier to understand and change.
Key takeaways
- Organize growing applications around product features, not only file types.
- Keep data access, domain logic, and presentation responsibilities distinct.
- Introduce abstractions after repetition and change pressure become visible.
Start with the application boundaries
Architecture is the set of boundaries that makes change predictable. Before choosing folders, identify the product areas, shared platform concerns, external services, and routes in the application. A useful structure reflects how the product is discussed by the team.
Small applications do not need an elaborate hierarchy. Start with a clear minimum and allow the structure to grow with the product. Architecture should reduce cognitive load, not create ceremony.
Prefer feature-oriented organization as the app grows
A file-type structure such as components, hooks, and utils works for a small project. In a larger product, related booking files become scattered across many directories. Feature-oriented folders keep the code required for one product area close together.
- app or routes: route composition and page-level loading
- features: product capabilities such as booking, auth, and billing
- components: genuinely shared visual components
- lib: framework adapters and shared infrastructure
- types: cross-feature contracts only when they are truly shared
Separate server data from UI state
Remote data and local interface state have different lifecycles. Server data needs caching, refetching, invalidation, and error handling. UI state represents temporary interactions such as an open dialog, selected tab, or draft input.
Keeping these concerns distinct prevents a global store from becoming a second database. Use the smallest suitable owner for each state value and move it upward only when multiple parts of the interface genuinely need it.
Control dependency direction
Feature code may depend on shared primitives, but shared primitives should not import a product feature. This simple direction avoids hidden cycles and keeps reusable code reusable.
Place API calls behind small, typed functions. Components should express what information they need without knowing every transport detail. Do not hide all calls behind a generic request abstraction; preserve meaningful domain names such as createBooking or getAvailableSlots.
Use abstractions when change justifies them
Premature abstraction makes simple behavior harder to follow. Repetition is not automatically a problem: two similar components may change for different reasons. Extract a shared layer when the repeated behavior represents the same concept and maintaining copies creates real risk.
Review architecture through actual changes. If a routine feature requires edits across unrelated areas, the boundaries may be wrong. If developers cannot tell where new code belongs, naming or ownership needs attention.
Frequently asked questions
What is the best folder structure for a React project?
There is no universal structure. Small apps can use a simple components-and-pages layout. Growing products usually benefit from feature-oriented folders with separate shared UI and infrastructure layers.
When should I use a global state library?
Use one when state is shared across distant parts of the interface and cannot be modeled well as server data, URL state, or colocated component state. Avoid moving all state into a global store by default.
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