Why a React Mobile Hook Breaks SSR and How to Build a Hydration-Safe Version
A useIsMobile hook returns false on the server because no screen width exists during server rendering, so the hydration pass must repeat that guess. Reading window during render can cause hydration errors when the text differs, and in other cases it leaves the server's value on screen until hydration completes. The article recommends using CSS breakpoints for visible layout changes, since they apply at first paint. For behavior after user interaction, it proposes a hook built on useSyncExternalStore with a server snapshot, so hydration matches and later mounts read the real value immediately.
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