React

AI code reviewfor React and Next.js

Hooks misuse, stale closures, hydration mismatches, and client-server boundary bugs show up constantly in frontend PRs. CodeCritic reads JSX and TypeScript changes with UI-specific context.

hooksNext.js App RouteraccessibilityTypeScriptcomponent tests
How it works

Effects and dependencies

Flags missing effect cleanup, unstable dependency arrays, and state updates that race with unmount.

Server and client boundaries

Surfaces accidental browser-only APIs in server components and unsafe data passed across the wire.

a11y in components

Calls out interactive elements without labels, keyboard traps, and roles that do not match behavior.

What we look for in UI diffs

Frontend review goes beyond syntax into how components behave in the browser.

  • Conditional hooks and render-path inconsistencies.
  • Memoization that hides bugs or over-invalidates caches.
  • Form state and optimistic updates without rollback paths.
  • Bundle-heavy imports in hot paths when lighter alternatives exist.

Sample output

Example findings

Should fix

Effect runs on every render

The dependency array is empty but the effect reads props.userId. Stale data or infinite loops can follow.

Before

useEffect(() => {
  fetchProfile(props.userId);
}, []);

Suggested direction

useEffect(() => {
  fetchProfile(props.userId);
}, [props.userId]);

Illustrative patterns from real review categories. Your output depends on diff size, language, and context.

FAQ

Common questions

No. Keep eslint-plugin-react-hooks for fast deterministic checks. CodeCritic adds narrative context across files in the same PR.

Related pages

Rails reviewDiff reviewSecurity review

Review the next UI PR with React-aware context

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Integrations