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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><title>React Hooks for Data Fetching – SWR</title><meta name="robots" content="index,follow"/><meta property="og:title" content="React Hooks for Data Fetching – SWR"/><meta name="theme-color" content="#111" media="(prefers-color-scheme: dark)"/><meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover"/><style> :root { --nextra-primary-hue: 212deg; --nextra-navbar-height: 4rem; --nextra-menu-height: 3.75rem; --nextra-banner-height: 2.5rem; } .dark { --nextra-primary-hue: 204deg; } </style><link rel="apple-touch-icon" sizes="180x180" href="/favicon/apple-touch-icon.png"/><link rel="icon" type="image/png" sizes="32x32" href="/favicon/favicon-32x32.png"/><link rel="icon" type="image/png" sizes="16x16" href="/favicon/favicon-16x16.png"/><link rel="icon" type="image/svg+xml" href="/favicon/favicon.svg"/><link rel="manifest" href="/favicon/site.webmanifest"/><link rel="mask-icon" href="/favicon/safari-pinned-tab.svg" color="#000000"/><meta http-equiv="Content-Language" content="en-US, zh-CN, es-ES, fr-FR, pt-BR, ja, ko, ru"/><meta name="msapplication-TileColor" content="#ffffff"/><meta name="apple-mobile-web-app-title" content="SWR"/><meta name="description" content="SWR is a React Hooks library for data fetching. 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[-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/global-configuration">Global Configuration</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/data-fetching">Data Fetching</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/revalidation">Auto Revalidation</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border 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Revalidation</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/error-handling">Error Handling</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/conditional-fetching">Conditional Data Fetching</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/pagination">Pagination</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/subscription">Subscription</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/prefetching">Prefetching</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/with-nextjs">Next.js SSG and SSR</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/typescript">TypeScript</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/suspense">Suspense</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/middleware">Middleware</a></li><li class=""><button class="nx-items-center nx-justify-between nx-gap-2 nx-text-left nx-w-full nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50">Advanced<svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="nx-h-[18px] nx-min-w-[18px] nx-rounded-sm nx-p-0.5 hover:nx-bg-gray-800/5 dark:hover:nx-bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="nx-origin-center nx-transition-transform rtl:-nx-rotate-180"></path></svg></button><div class="nx-transform-gpu nx-overflow-hidden nx-transition-all nx-ease-in-out motion-reduce:nx-transition-none" style="height:0"><div class="nx-transition-opacity nx-duration-500 nx-ease-in-out motion-reduce:nx-transition-none nx-opacity-0 ltr:nx-pr-0 rtl:nx-pl-0 nx-pt-1"><ul class="nx-flex nx-flex-col nx-gap-1 nx-relative before:nx-absolute before:nx-inset-y-1 before:nx-w-px before:nx-bg-gray-200 before:nx-content-[""] dark:before:nx-bg-neutral-800 ltr:nx-pl-3 ltr:before:nx-left-0 rtl:nx-pr-3 rtl:before:nx-right-0 ltr:nx-ml-3 rtl:nx-mr-3"><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/advanced/understanding">Understanding SWR</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/advanced/cache">Cache</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/advanced/performance">Performance</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/advanced/react-native">React Native</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/docs/advanced/devtools">Developer Tools</a></li></ul></div></div></li><li class="nx-flex nx-flex-col nx-gap-1"><a href="https://github.com/vercel/swr/releases" target="_blank" rel="noreferrer" class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50">Change Log<span class="nx-sr-only"> (opens in a new tab)</span></a></li></ul></div></div></li><li class="open"><button class="nx-items-center nx-justify-between nx-gap-2 nx-text-left nx-w-full nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50">Examples<svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="nx-h-[18px] nx-min-w-[18px] nx-rounded-sm nx-p-0.5 hover:nx-bg-gray-800/5 dark:hover:nx-bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="nx-origin-center nx-transition-transform rtl:-nx-rotate-180 ltr:nx-rotate-90 rtl:nx-rotate-[-270deg]"></path></svg></button><div class="nx-transform-gpu nx-overflow-hidden nx-transition-all nx-ease-in-out motion-reduce:nx-transition-none"><div class="nx-transition-opacity nx-duration-500 nx-ease-in-out motion-reduce:nx-transition-none nx-opacity-100 ltr:nx-pr-0 rtl:nx-pl-0 nx-pt-1"><ul class="nx-flex nx-flex-col nx-gap-1 nx-relative before:nx-absolute before:nx-inset-y-1 before:nx-w-px before:nx-bg-gray-200 before:nx-content-[""] dark:before:nx-bg-neutral-800 ltr:nx-pl-3 ltr:before:nx-left-0 rtl:nx-pr-3 rtl:before:nx-right-0 ltr:nx-ml-3 rtl:nx-mr-3"><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/examples/basic">Basic Usage</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/examples/auth">Authentication</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/examples/optimistic-ui">Optimistic UI</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/examples/infinite-loading">Infinite Loading</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/examples/error-handling">Error Handling</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/examples/ssr">Next.js SSR</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/examples/subscription">Subscription</a></li></ul></div></div></li><li class="open"><a class="nx-items-center nx-justify-between nx-gap-2 nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/blog">Blog<svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="nx-h-[18px] nx-min-w-[18px] nx-rounded-sm nx-p-0.5 hover:nx-bg-gray-800/5 dark:hover:nx-bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="nx-origin-center nx-transition-transform rtl:-nx-rotate-180 ltr:nx-rotate-90 rtl:nx-rotate-[-270deg]"></path></svg></a><div class="nx-transform-gpu nx-overflow-hidden nx-transition-all nx-ease-in-out motion-reduce:nx-transition-none"><div class="nx-transition-opacity nx-duration-500 nx-ease-in-out motion-reduce:nx-transition-none nx-opacity-100 ltr:nx-pr-0 rtl:nx-pl-0 nx-pt-1"><ul class="nx-flex nx-flex-col nx-gap-1 nx-relative before:nx-absolute before:nx-inset-y-1 before:nx-w-px before:nx-bg-gray-200 before:nx-content-[""] dark:before:nx-bg-neutral-800 ltr:nx-pl-3 ltr:before:nx-left-0 rtl:nx-pr-3 rtl:before:nx-right-0 ltr:nx-ml-3 rtl:nx-mr-3"><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/blog/swr-v2">Announcing SWR 2.0</a></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-500 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/blog/swr-v1">Announcing SWR 1.0</a></li></ul></div></div></li></ul></div><div class="nx-sticky nx-bottom-0 nx-bg-white dark:nx-bg-dark nx-mx-4 nx-py-4 nx-shadow-[0_-12px_16px_#fff] nx-flex nx-items-center nx-gap-2 dark:nx-border-neutral-800 dark:nx-shadow-[0_-12px_16px_#111] contrast-more:nx-border-neutral-400 contrast-more:nx-shadow-none contrast-more:dark:nx-shadow-none nx-justify-end nx-border-t" data-toggle-animation="off"><button title="Change language" class="nx-h-7 nx-rounded-md nx-px-2 nx-text-left nx-text-xs nx-font-medium nx-text-gray-600 nx-transition-colors dark:nx-text-gray-400 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 nx-grow" id="headlessui-listbox-button-:R2fjcm:" type="button" aria-haspopup="listbox" aria-expanded="false" data-headlessui-state=""><span class="nx-flex nx-items-center nx-gap-2"><svg viewBox="2 2 16 16" width="12" height="12" fill="currentColor"><path fill-rule="evenodd" d="M4.083 9h1.946c.089-1.546.383-2.97.837-4.118A6.004 6.004 0 004.083 9zM10 2a8 8 0 100 16 8 8 0 000-16zm0 2c-.076 0-.232.032-.465.262-.238.234-.497.623-.737 1.182-.389.907-.673 2.142-.766 3.556h3.936c-.093-1.414-.377-2.649-.766-3.556-.24-.56-.5-.948-.737-1.182C10.232 4.032 10.076 4 10 4zm3.971 5c-.089-1.546-.383-2.97-.837-4.118A6.004 6.004 0 0115.917 9h-1.946zm-2.003 2H8.032c.093 1.414.377 2.649.766 3.556.24.56.5.948.737 1.182.233.23.389.262.465.262.076 0 .232-.032.465-.262.238-.234.498-.623.737-1.182.389-.907.673-2.142.766-3.556zm1.166 4.118c.454-1.147.748-2.572.837-4.118h1.946a6.004 6.004 0 01-2.783 4.118zm-6.268 0C6.412 13.97 6.118 12.546 6.03 11H4.083a6.004 6.004 0 002.783 4.118z" clip-rule="evenodd"></path></svg><span class="">English</span></span></button><div class=""><button title="Change theme" class="nx-h-7 nx-rounded-md nx-px-2 nx-text-left nx-text-xs nx-font-medium nx-text-gray-600 nx-transition-colors dark:nx-text-gray-400 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50" id="headlessui-listbox-button-:R2njcm:" type="button" aria-haspopup="listbox" aria-expanded="false" data-headlessui-state=""><div class="nx-flex nx-items-center nx-gap-2 nx-capitalize"><svg fill="none" viewBox="3 3 18 18" width="12" height="12" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" fill="currentColor" d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z"></path></svg><span class="md:nx-hidden">Light</span></div></button></div></div></aside><nav class="nextra-toc nx-order-last nx-hidden nx-w-64 nx-shrink-0 xl:nx-block print:nx-hidden" aria-label="table of contents"></nav><div id="reach-skip-nav"></div><article class="nx-w-full nx-break-words nextra-content nx-flex nx-min-h-[calc(100vh-var(--nextra-navbar-height))] nx-min-w-0 nx-justify-center nx-pb-8 nx-pr-[calc(env(safe-area-inset-right)-1.5rem)]"><main class="nx-w-full nx-min-w-0 nx-max-w-6xl nx-px-6 nx-pt-4 md:nx-px-12"> <h1 class="text-center text-4xl tracking-tighter font-extrabold md:text-5xl mt-8">SWR</h1> <div class="nextra-bleed nx-relative -nx-mx-6 nx-mt-6 md:-nx-mx-8 2xl:-nx-mx-24"><div class="mx-auto max-w-full w-[880px] text-center px-4 mb-10"><p class="text-lg mb-2 text-gray-600 md:!text-2xl">React Hooks for Data Fetching</p><div class="features_features__9rY_s"><div class="features_feature__nZHJN"><svg viewBox="0 0 24 24" width="24" height="24" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"><path d="M20.24 12.24a6 6 0 0 0-8.49-8.49L5 10.5V19h8.5z"></path><line x1="16" y1="8" x2="2" y2="22"></line><line x1="17.5" y1="15" x2="9" y2="15"></line></svg><h4>Lightweight</h4></div><div class="features_feature__nZHJN"><svg width="24" height="24" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" shape-rendering="geometricPrecision" viewBox="0 0 24 24"><path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"></path></svg><h4>Realtime</h4></div><div class="features_feature__nZHJN"><svg viewBox="0 0 24 24" width="24" height="24" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle><line x1="10" y1="15" x2="10" y2="9"></line><line x1="14" y1="15" x2="14" y2="9"></line></svg><h4>Suspense</h4></div><div class="features_feature__nZHJN"><svg viewBox="0 0 24 24" width="24" height="24" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="1"></circle><circle cx="12" cy="5" r="1"></circle><circle cx="12" cy="19" r="1"></circle></svg><h4>Pagination</h4></div><div class="features_feature__nZHJN"><svg viewBox="0 0 24 24" width="24" height="24" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" fill="none" shape-rendering="geometricPrecision"><path d="M20 17.58A5 5 0 0018 8h-1.26A8 8 0 104 16.25"></path><path d="M8 16h.01"></path><path d="M8 20h.01"></path><path d="M12 18h.01"></path><path d="M12 22h.01"></path><path d="M16 16h.01"></path><path d="M16 20h.01"></path></svg><h4>Backend Agnostic</h4></div><div class="features_feature__nZHJN"><svg width="24" height="24" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" shape-rendering="geometricPrecision" viewBox="0 0 24 24"><path d="M12 2L2 7l10 5 10-5-10-5zM2 17l10 5 10-5M2 12l10 5 10-5"></path></svg><h4>SSR / SSG Ready</h4></div><div class="features_feature__nZHJN"><svg width="24" height="24" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" shape-rendering="geometricPrecision" viewBox="0 0 24 24"><path d="M16.5 9.4l-9-5.19M21 16V8a2 2 0 00-1-1.73l-7-4a2 2 0 00-2 0l-7 4A2 2 0 003 8v8a2 2 0 001 1.73l7 4a2 2 0 002 0l7-4A2 2 0 0021 16z"></path><path d="M3.27 6.96L12 12.01l8.73-5.05M12 22.08V12"></path></svg><h4>TypeScript Ready</h4></div><div class="features_feature__nZHJN"><svg width="24" height="24" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" shape-rendering="geometricPrecision" viewBox="0 0 24 24"><circle cx="12" cy="12" r="2"></circle><path d="M16.24 7.76a6 6 0 010 8.49m-8.48-.01a6 6 0 010-8.49m11.31-2.82a10 10 0 010 14.14m-14.14 0a10 10 0 010-14.14"></path></svg><h4>Remote + Local</h4></div></div></div></div> <p class="nx-mt-6 nx-leading-7 first:nx-mt-0">The name “SWR” is derived from <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">stale-while-revalidate</code>, a HTTP cache invalidation strategy popularized by <a href="https://tools.ietf.org/html/rfc5861" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">HTTP RFC 5861<span class="nx-sr-only"> (opens in a new tab)</span></a>. SWR is a strategy to first return the data from cache (stale), then send the fetch request (revalidate), and finally come with the up-to-date data.</p> <div class="nextra-callout nx-overflow-x-auto nx-mt-6 nx-flex nx-rounded-lg nx-border nx-py-2 ltr:nx-pr-4 rtl:nx-pl-4 contrast-more:nx-border-current contrast-more:dark:nx-border-current nx-border-orange-100 nx-bg-orange-50 nx-text-orange-800 dark:nx-border-orange-400/30 dark:nx-bg-orange-400/20 dark:nx-text-orange-300"><div class="nx-select-none nx-text-xl ltr:nx-pl-3 ltr:nx-pr-2 rtl:nx-pr-3 rtl:nx-pl-2" style="font-family:"Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"">✅</div><div class="nx-w-full nx-min-w-0 nx-leading-7"><p class="nx-mt-6 nx-leading-7 first:nx-mt-0">With SWR, components will get a stream of data updates <strong>constantly</strong> and <strong>automatically</strong>.<br/> And the UI will be always <strong>fast</strong> and <strong>reactive</strong>.</p></div></div> <div class="mt-16 mb-20 text-center"><p class="nx-mt-6 nx-leading-7 first:nx-mt-0"><a class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]" href="/docs/getting-started">Get Started</a> · <a class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]" href="/examples/basic">Examples</a> · <a class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]" href="/blog">Blog</a> · <a href="https://github.com/vercel/swr" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">GitHub Repository<span class="nx-sr-only"> (opens in a new tab)</span></a></p></div> <h2 class="nx-font-semibold nx-tracking-tight nx-text-slate-900 dark:nx-text-slate-100 nx-mt-10 nx-border-b nx-pb-1 nx-text-3xl nx-border-neutral-200/70 contrast-more:nx-border-neutral-400 dark:nx-border-primary-100/10 contrast-more:dark:nx-border-neutral-400">Overview<span class="nx-absolute -nx-mt-20" id="overview"></span><a href="#overview" class="subheading-anchor" aria-label="Permalink for this section"></a></h2> <div class="nextra-code-block nx-relative nx-mt-6 first:nx-mt-0"><pre class="nx-bg-primary-700/5 nx-mb-4 nx-overflow-x-auto nx-rounded-xl nx-font-medium nx-subpixel-antialiased dark:nx-bg-primary-300/10 nx-text-[.9em] contrast-more:nx-border contrast-more:nx-border-primary-900/20 contrast-more:nx-contrast-150 contrast-more:dark:nx-border-primary-100/40 nx-py-4 " data-language="jsx" data-theme="default"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr" data-language="jsx" data-theme="default"><span class="line"><span style="color:var(--shiki-token-keyword)">import</span><span style="color:var(--shiki-color-text)"> useSWR </span><span style="color:var(--shiki-token-keyword)">from</span><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-string-expression)">'swr'</span></span> <span class="line"> </span> <span class="line"><span style="color:var(--shiki-token-keyword)">function</span><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-function)">Profile</span><span style="color:var(--shiki-color-text)">() {</span></span> <span class="line"><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-keyword)">const</span><span style="color:var(--shiki-color-text)"> { </span><span style="color:var(--shiki-token-constant)">data</span><span style="color:var(--shiki-token-punctuation)">,</span><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-constant)">error</span><span style="color:var(--shiki-token-punctuation)">,</span><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-constant)">isLoading</span><span style="color:var(--shiki-color-text)"> } </span><span style="color:var(--shiki-token-keyword)">=</span><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-function)">useSWR</span><span style="color:var(--shiki-color-text)">(</span><span style="color:var(--shiki-token-string-expression)">'/api/user'</span><span style="color:var(--shiki-token-punctuation)">,</span><span style="color:var(--shiki-color-text)"> fetcher)</span></span> <span class="line"> </span> <span class="line"><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-keyword)">if</span><span style="color:var(--shiki-color-text)"> (error) </span><span style="color:var(--shiki-token-keyword)">return</span><span style="color:var(--shiki-color-text)"> <</span><span style="color:var(--shiki-token-string-expression)">div</span><span style="color:var(--shiki-color-text)">>failed to load</</span><span style="color:var(--shiki-token-string-expression)">div</span><span style="color:var(--shiki-color-text)">></span></span> <span class="line"><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-keyword)">if</span><span style="color:var(--shiki-color-text)"> (isLoading) </span><span style="color:var(--shiki-token-keyword)">return</span><span style="color:var(--shiki-color-text)"> <</span><span style="color:var(--shiki-token-string-expression)">div</span><span style="color:var(--shiki-color-text)">>loading...</</span><span style="color:var(--shiki-token-string-expression)">div</span><span style="color:var(--shiki-color-text)">></span></span> <span class="line"><span style="color:var(--shiki-color-text)"> </span><span style="color:var(--shiki-token-keyword)">return</span><span style="color:var(--shiki-color-text)"> <</span><span style="color:var(--shiki-token-string-expression)">div</span><span style="color:var(--shiki-color-text)">>hello {</span><span style="color:var(--shiki-token-constant)">data</span><span style="color:var(--shiki-color-text)">.name}!</</span><span style="color:var(--shiki-token-string-expression)">div</span><span style="color:var(--shiki-color-text)">></span></span> <span class="line"><span style="color:var(--shiki-color-text)">}</span></span></code></pre><div class="nx-opacity-0 nx-transition [div:hover>&]:nx-opacity-100 focus-within:nx-opacity-100 nx-flex nx-gap-1 nx-absolute nx-m-[11px] nx-right-0 nx-top-0"><button class="nextra-button nx-transition-all active:nx-opacity-50 nx-bg-primary-700/5 nx-border nx-border-black/5 nx-text-gray-600 hover:nx-text-gray-900 nx-rounded-md nx-p-1.5 dark:nx-bg-primary-300/10 dark:nx-border-white/10 dark:nx-text-gray-400 dark:hover:nx-text-gray-50 md:nx-hidden" title="Toggle word wrap"><svg viewBox="0 0 24 24" width="24" height="24" class="nx-pointer-events-none nx-h-4 nx-w-4"><path fill="currentColor" d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3l3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"></path></svg></button><button class="nextra-button nx-transition-all active:nx-opacity-50 nx-bg-primary-700/5 nx-border nx-border-black/5 nx-text-gray-600 hover:nx-text-gray-900 nx-rounded-md nx-p-1.5 dark:nx-bg-primary-300/10 dark:nx-border-white/10 dark:nx-text-gray-400 dark:hover:nx-text-gray-50 " title="Copy code" tabindex="0"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" stroke="currentColor" class="nextra-copy-icon nx-pointer-events-none nx-h-4 nx-w-4"><rect x="9" y="9" width="13" height="13" rx="2" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></rect><path d="M5 15H4C2.89543 15 2 14.1046 2 13V4C2 2.89543 2.89543 2 4 2H13C14.1046 2 15 2.89543 15 4V5" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg></button></div></div> <p class="nx-mt-6 nx-leading-7 first:nx-mt-0">In this example, the <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">useSWR</code> hook accepts a <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">key</code> string and a <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">fetcher</code> function. <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">key</code> is a unique identifier of the data (normally the API URL) and will be passed to <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">fetcher</code>. <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">fetcher</code> can be any asynchronous function which returns the data, you can use the native fetch or tools like Axios.</p> <p class="nx-mt-6 nx-leading-7 first:nx-mt-0">The hook returns 3 values: <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">data</code>, <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">isLoading</code> and <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10 " dir="ltr">error</code>, based on the status of the request.</p> <h2 class="nx-font-semibold nx-tracking-tight nx-text-slate-900 dark:nx-text-slate-100 nx-mt-10 nx-border-b nx-pb-1 nx-text-3xl nx-border-neutral-200/70 contrast-more:nx-border-neutral-400 dark:nx-border-primary-100/10 contrast-more:dark:nx-border-neutral-400">Features<span class="nx-absolute -nx-mt-20" id="features"></span><a href="#features" class="subheading-anchor" aria-label="Permalink for this section"></a></h2> <p class="nx-mt-6 nx-leading-7 first:nx-mt-0">With just one single line of code, you can simplify the logic of data fetching in your project, and also have all these amazing features out-of-the-box:</p> <ul class="nx-mt-6 nx-list-disc first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6"> <li class="nx-my-2"><strong>Fast</strong>, <strong>lightweight</strong> and <strong>reusable</strong> data fetching</li> <li class="nx-my-2">Built-in <strong>cache</strong> and request deduplication</li> <li class="nx-my-2"><strong>Real-time</strong> experience</li> <li class="nx-my-2">Transport and protocol agnostic</li> <li class="nx-my-2">SSR / ISR / SSG support</li> <li class="nx-my-2">TypeScript ready</li> <li class="nx-my-2">React Native</li> </ul> <p class="nx-mt-6 nx-leading-7 first:nx-mt-0">SWR has you covered in all aspects of speed, correctness, and stability to help you build better experiences:</p> <ul class="nx-mt-6 nx-list-disc first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6"> <li class="nx-my-2">Fast page navigation</li> <li class="nx-my-2">Polling on interval</li> <li class="nx-my-2">Data dependency</li> <li class="nx-my-2">Revalidation on focus</li> <li class="nx-my-2">Revalidation on network recovery</li> <li class="nx-my-2">Local mutation (Optimistic UI)</li> <li class="nx-my-2">Smart error retry</li> <li class="nx-my-2">Pagination and scroll position recovery</li> <li class="nx-my-2">React Suspense</li> </ul> <p class="nx-mt-6 nx-leading-7 first:nx-mt-0">And a lot <a class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]" href="/docs/getting-started">more</a>.</p> <h2 class="nx-font-semibold nx-tracking-tight nx-text-slate-900 dark:nx-text-slate-100 nx-mt-10 nx-border-b nx-pb-1 nx-text-3xl nx-border-neutral-200/70 contrast-more:nx-border-neutral-400 dark:nx-border-primary-100/10 contrast-more:dark:nx-border-neutral-400">Community<span class="nx-absolute -nx-mt-20" id="community"></span><a href="#community" class="subheading-anchor" aria-label="Permalink for this section"></a></h2> <p class="flex h-6 mt-4 gap-2"><img alt="stars" src="https://badgen.net/github/stars/vercel/swr"/><img alt="downloads" src="https://badgen.net/npm/dt/swr"/><img alt="license" src="https://badgen.net/npm/license/swr"/></p> <p class="nx-mt-6 nx-leading-7 first:nx-mt-0">SWR is created by the same team behind <a href="https://nextjs.org" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">Next.js<span class="nx-sr-only"> (opens in a new tab)</span></a>, the React framework. 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