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SWR is a React Hooks library for data fetching that keeps UI data fresh by revalidating on focus, on network recovery, and at intervals. It exposes a useSWR hook that fetches data with a key and a fetcher, caches responses, deduplicates requests, and lets you reuse data across components via custom hooks. The library supports REST, GraphQL, and other fetchers, includes built-in caching and revalidation strategies, and works with SSR/SSG hydration to build fast, reactive apps with real-time updates.
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