How a Browser Network Tab Revealed Redundant API Calls and Led to a React Query Fix

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A developer building a currency-switching feature discovered their app was making repeated database requests to Supabase every time the Settings page was revisited, despite using React Query. Investigating the browser's Network tab revealed the root cause: React Query's default staleTime of zero causes cached data to be treated as stale immediately, triggering a fresh server fetch on each page return. Setting staleTime to Infinity told React Query to treat fetched currency data as permanently fresh, eliminating unnecessary repeat requests. The developer also configured gcTime to Infinity to ensure unused cached data was not garbage-collected during the active session. The experience highlighted the practical difference between data being cached and data being considered fresh — two distinct concepts in React Query's caching model.

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ProgrammingDEV Community ·

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