React Component Hierarchy Best Practices for UI Projects
A good component hierarchy keeps a React UI maintainable. Here are the best practices.
React Component Hierarchy Best Practices for UI Projects
A good component hierarchy keeps a React UI maintainable as it grows. Here are the best practices.
Pages at the Top
Top-level components are pages, one per route. Pages compose the layout and the feature components for that screen.
Feature Components in the Middle
Below pages are feature components like Feed, ProfileCard, and ChatWindow. These hold the logic for a specific feature area.
Primitives at the Bottom
At the bottom are reusable primitives like Button, Input, Card, and Avatar. These are dumb, presentational, and reused across features.
One Direction of Data Flow
Data flows down through the hierarchy via props, and events flow up via callbacks. Respect this one-way flow; do not push data sideways.
State Lives at the Right Level
State that only one component needs stays local. State shared across siblings goes to the common parent. Lifting everything to the top creates unnecessary re-renders.
Split by Responsibility
Split a component when it does more than one thing. A card that handles its own data fetching and rendering is doing two things; split the fetching into a hook.
Keep Nesting Shallow Where Possible
Deeply nested hierarchies are hard to follow. If a component is six levels deep, consider flattening the structure or extracting a feature.
The Takeaway
A good hierarchy has pages at the top, feature components in the middle, and primitives at the bottom, with one-way data flow and state at the right level. Split by responsibility and keep nesting shallow where possible.
Pages at the top per route, feature components in the middle like Feed and ProfileCard, and reusable primitives like Button and Card at the bottom. Data flows down via props and events up via callbacks, in one direction.
Primitives are reusable presentational components like Button, Input, Card, and Avatar, used across features. Feature components like Feed and ChatWindow hold the logic for a specific feature area. Primitives are bottom, features are middle.
State that only one component needs stays local. State shared across siblings goes to the common parent. Do not lift everything to the top, which causes unnecessary re-renders across the tree.
When it does more than one thing. A card that handles its own data fetching and rendering is doing two things; split the fetching into a custom hook. Split by responsibility, not by line count.
Because deeply nested hierarchies are hard to follow and prop drilling becomes painful. If a component is six levels deep, consider flattening the structure or extracting a feature, so the code stays readable.
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