Zero-flicker Firestore SSR with React

Firebase’s SSR-specific JavaScript SDK APIs enable Next.js applications to fetch Firestore data on the server for faster initial rendering, serialize query snapshots with toJSON(), and pass them to Client Components for immediate hydration. On the client, querySnapshotFromJSON restores the initial data while onSnapshotResume continues the listener from that state, helping avoid layout flickers and redundant database reads while preserving real-time updates. The approach can be encapsulated in a reusable React hook that manages restored and live snapshot states, synchronization errors, and listener cleanup. Serialization increases HTML payload size and client-side complexity, so initial queries should be kept small with limits, while pages without real-time needs can render data entirely on the server and slow-changing shared data may be better served through Firestore data bundles.

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