Mengapa nggunakne library server-state kayak React Query?

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**Server-state libraries** (React Query/TanStack Query, SWR, RTK Query) khusus mengelola **data sing dijupuk saka server** — nyambut minangka cache supaya tetep sinkron karo sumber remote. Dheweke nangani caching, loading/error states, refetching, lan deduplication kanthi otomatis, ngganti jumlah kode manual sing akeh banget. ## Apa sing penting Data server *dumunung ana ing server* lan mung dicache ing client, dadi bisa dadi **kadaluwarsa**. Ngatur dheweke kanthi tangan tegese ngimplement ulang caching, loading/error tracking, refetching, retries, lan deduplication kanggo saben endpoint — rawan salah lan negatak. ## Apa sing diwenehake React Query ing siji hook ```jsx import { useQuery } from "@tanstack/react-query"; function Users() { const { data, isLoading, error, refetch } = useQuery({ queryKey: ["users"], // cache key queryFn: () => fetch("/api/users").then(r => r.json()), staleTime: 60_000, // consider fresh for 1 min }); if (isLoading) return ; if (error) return ; return ; } ``` Hook siji kuwi menehi: ```text ✓ Caching — data cached by queryKey, shared across components ✓ Loading/error — isLoading/error states managed for you ✓ Deduplication — same query in 5 components = ONE network request ✓ Background refetch— refetch on window focus/reconnect to stay fresh ✓ Stale-while-revalidate — show cached data instantly, refetch in background ✓ Retries — auto-retry failed requests ✓ Pagination/infinite scroll, prefetching, cache invalidation ``` ## Mutations + cache invalidation ```jsx const mutation = useMutation({ mutationFn: (user) => api.createUser(user), onSuccess: () => queryClient.invalidateQueries({ queryKey: ["users"] }), // refetch the list }); ``` Mburi mutation, sampeyan ngilangake query sing ana isine lan cache bakal refetch maneh — njaga UI tetep padha karo server. ## Butuh "global state" dadi susut ```text Much of what people put in Redux is actually SERVER state. Moving it to React Query often shrinks global state to just true UI state (theme, modals, filters) — simplifying the whole app. ``` Server-state libraries ngatasi masalah sing tool state umum (Redux, useState) tangani kurang becik: njaga client cache tetep sinkron karo data remote. Dheweke ngganti ratusan baris kode fetching/caching/loading tangan kanthi hooks deklaratif, lan menehi tingkah laku canggih (dedup, background refetch, stale-while-revalidate) sing angel dibuat kanthi bener nganggo tangan. Ngenali yen server state kudu tool dedhekan dheweke — lan yen nggunakne siji asring nyederhanakake global state kanthi drastis — minangka salah siji wawasan arsitektur frontend paling ngaribake ing jaman modern.