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React useIntersectionObserver Hook
React useIntersectionObserver hook for viewport visibility detection. Lazy loading, infinite scroll, animations. TypeScript ready.
Detect when elements enter or leave the viewport with the native Intersection Observer API. useIntersectionObserver returns isIntersecting boolean, the full entry object, and a ref callback. Configure threshold, rootMargin, and freezeOnceVisible for lazy loading images or one-time animations. Supports both array and object destructuring. Auto-disconnects observer on unmount. Perfect for infinite scroll, fade-in effects, analytics tracking, or sticky headers. SSR safe—observer only created client-side. Works with Next.js App Router and any React framework.
React useIntersectionObserver Hook preview
Installation
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