React Best Practices in 2025: Patterns and Anti-Patterns

React continues to evolve, and so do best practices. Here's my comprehensive guide to writing clean, performant React code in 2025.

Component Design

Favor Composition Over Inheritance

React's composition model is powerful. Instead of complex inheritance hierarchies, compose smaller, focused components.

Single Responsibility Principle

Each component should do one thing well. If a component is doing too much, split it.

Use Custom Hooks for Logic

Extract reusable logic into custom hooks. This keeps components clean and makes testing easier.

State Management

Local State First

Start with local state (useState). Only reach for global state when truly necessary.

Server State vs Client State

Use React Query or SWR for server state. They handle caching, revalidation, and loading states automatically.

Avoid Prop Drilling

For deep component trees, use Context or state management libraries instead of passing props through many levels.

Performance Optimization

Memoization

Use useMemo and useCallback appropriately - but don't over-optimize. Profile first, optimize second.

Code Splitting

Lazy load routes and heavy components to reduce initial bundle size.

Virtual Lists

For long lists, use virtualization libraries like react-window.

Common Anti-Patterns

1. Premature Optimization

Don't memoize everything. React is fast by default.

2. Giant Components

Break down large components into smaller, focused ones.

3. Not Using Keys Properly

Always use stable, unique keys for list items.

4. Ignoring Accessibility

Build accessible components from the start.

Testing

Test User Behavior

Test what users see and do, not implementation details.

Integration Over Unit Tests

Integration tests catch more real bugs than unit tests.

TypeScript Integration

Use Strict Mode

Enable strict TypeScript for maximum type safety.

Type Props Properly

Define clear interfaces for component props.

Conclusion

Following these practices will help you build maintainable, performant React applications. Remember: simplicity wins.