React DevTools browser extension inspects the component tree and shows props, state, and which components re-rendered. The Profiler records render times and shows why each component re-rendered. Install from Chrome store.
React Developer Tools
Install the React DevTools browser extension to:
- Inspect component tree and props
- Profile renders and identify slow components
- View and modify state in real time
- Highlight components that re-rendered
In Chrome: F12 → Components tab / Profiler tab