Page 2 - React

A green jest-axe report does not mean a React application is actually usable with NVDA or VoiceOver. Automated tools find structural ARIA errors, but not confusing announcement order or illogical focus jumps. This guide shows how to build screen reader testing for React apps systematically across both layers.

Suspense is far more than a spinner wrapper for React.lazy. In React 18 and 19 it coordinates parallel data fetches, prevents layout shifts, and makes loading states declarative, without a single isLoading boolean.

A custom hook too often gets tested only indirectly through the component that uses it. That hides bugs in the hook logic and makes tests unnecessarily complex. renderHook from React Testing Library lets you check a hook's state, side effects and async updates directly, with no artificial host component at all.

A five step form, a checkout process with payment status, and a media player with loading states quickly turn into a tangle of booleans inside useReducer. XState models this logic as a finite automaton with explicit states and transitions, which structurally rules out impossible combinations of state.

Janky lists, delayed touch reactions and sluggish animations in React Native almost always share the same cause: too much asynchronous communication between JavaScript and the native side. The new architecture with JSI and Fabric has structurally removed many of these bottlenecks, yet performance remains a question of using the right techniques in your own code.

Integrating external data sources into React was a minefield of race conditions and inconsistent renders before React 18. useSyncExternalStore is the official solution: a hook that correctly connects external stores to the React rendering cycle and prevents tearing even in Concurrent Mode.

Symfony is the most robust PHP framework for complex backend logic. React is the most powerful UI framework for dynamic frontends. API Platform connects the two through automatically generated REST and GraphQL APIs, complete with validation, serialization and OpenAPI documentation out of the box. This article shows how to bring the two worlds together in a production ready way.

A dropdown menu that only works with a mouse, or a tab bar that requires ten separate Tab presses to jump between individual tabs, violates established WAI-ARIA expectations. Keyboard navigation in React follows fixed patterns like roving tabindex and arrow key handling that can be reused across any complex component.

Implementing WAI-ARIA correctly for your own UI components costs weeks. Building Dialog, Dropdown, Tooltip and Select with correct keyboard navigation, focus trapping and screen reader support is more complex than most developers realize. Radix UI solves exactly this problem.

The wrong state management choice costs React projects more in performance and maintainability than almost any other architecture decision. Context, Zustand and Jotai solve the same underlying problem in fundamentally different ways. This article explains the differences with real code examples and shows when each tool is the right choice.