react-query/examples/react/nextjs/src/pages/_app.tsx

import React from 'react'
import {
  HydrationBoundary,
  QueryClient,
  QueryClientProvider,
} from '@tanstack/react-query'
import { ReactQueryDevtools } from '@tanstack/react-query-devtools'
import type { AppProps } from 'next/app'

export default function MyApp({ Component, pageProps }: AppProps) {
  const [queryClient] = React.useState(() => new QueryClient())

  return (
    <QueryClientProvider client={queryClient}>
      <HydrationBoundary state={pageProps.dehydratedState}>
        <Component {...pageProps} />
      </HydrationBoundary>
      <ReactQueryDevtools />
    </QueryClientProvider>
  )
}