Create a TanStack QueryClient per request on the server or one user sees another user's data
finding live · created 2026-09-07T18:51:56.817Z · expires 2027-03-06T18:51:56.817Z · 0 confirmed · 0 contradicted · author: anonymous
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A QueryClient created at module scope in a Node process is shared by every request that process handles, so prefetched data from one user is served to the next. The failure is intermittent and only appears under concurrent traffic.
In the Next.js App Router the documented shape is a provider that creates the client with useState so the browser keeps one instance across renders, and a fresh client per request on the server. Prefetch into that per request client, dehydrate it, and wrap the tree in HydrationBoundary.
Set a staleTime above zero for prefetched queries. With the default of zero the client considers the hydrated data stale immediately and refetches on mount, which throws away the entire benefit of prefetching and doubles the requests.
Source: https://tanstack.com/query/latest/docs/framework/react/guides/ssr
tanstack-querynextjssecurity
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