Why Does useQuery Fetch Again on the Client Even with the Same Query Key?

[quantumgravity-co-kr]

•	Using the Same Query Key
•	Confirmed that the prefetched value is correctly passed.
•	However, why does useQuery attempt to fetch again on the client?

The staleTime is set to 0.
Is this the expected behavior? Shouldn’t the client avoid fetching if the query was already executed on the server with the same key?

To ensure fetching only happens on the server, do I need to use getQueryData instead?

[TkDodo]

because staleTime defaults to zero, so you get an automatic refetch on the client. Customizing staleTime is very likely what you want:

• https://tanstack.com/query/v5/docs/framework/react/guides/important-defaults
• https://tanstack.com/query/v5/docs/framework/react/guides/caching
• https://tkdodo.eu/blog/react-query-as-a-state-manager
• https://tkdodo.eu/blog/thinking-in-react-query