The practice API's GET /books?page=0&limit=12 slices its 60 books and adds nextPage and total. Run it with node api/server.mjs next to Metro, and set EXPO_PUBLIC_API_URL=http://10.0.2.2:8150 in .env (a physical phone needs your computer's LAN address instead). On a fresh install, with nothing persisted, BookNest's first launch logged:
LOG catalog: 0 books, status pending, fetch idle LOG path: / LOG query cache restored LOG catalog: 0 books, status pending, fetch fetching LOG catalog: 12 books, status success, fetch idle 16:11:07 GET /books?page=0&limit=12 200
The query waited for the persister to finish restoring (nothing to restore yet), then fetched page 0 once, even though the screen rendered several times. Put together, BookNest now reads the catalog, book details and favorites through TanStack Query 79,069 , the cart through the persisted Zustand 58,763 store, and the user through a small context:
The cart badge counts four copies of Salt and Saffron, kept across every restart in this section. Three habits keep this healthy as BookNest grows: query keys come only from keys, components read the store only through selectors, and nothing fetched from the server is copied into Zustand.