Senior LevelReact JS & React 19
How do you design a scalable state architecture balancing URL state, server state, global state, and local state?
❓ Interview Prompt: Explain State Architecture Taxonomy: URL State (search params), Server State (TanStack Query), Global Client State (Zustand), and Local State (`useState`).
A scalable enterprise React application categorizes state into four explicit layers:
1
URL State (Search params): Pagination, active filters, selected tabs (shareable URLs!).
2
Server State (TanStack Query / RSC): Remote database records (cached, stale, invalidated).
3
Global Client State (Zustand / Redux): User session, UI theme, active shopping cart.
4
Local Component State ('useState'): Form inputs, dropdown toggles, modal open flags.
•
Rule: Never copy Server State into Global Client State stores!
Code Implementation Example
jsx
import { useQuery } from '@tanstack/react-query';
import { create } from 'zustand';
// 1. Global Client UI State (Zustand)
const useUIStore = create(set => ({
isSidebarOpen: false,
toggleSidebar: () => set(s => ({ isSidebarOpen: !s.isSidebarOpen }))
}));
// 2. Server Data State (TanStack Query)
function Profile() {
const { data } = useQuery({ queryKey: ['user'], queryFn: fetchUser });
}💡Categorizing state between global client UI stores and server data caches.
🎯 Interview Key Takeaway
Design state architecture by assigning data to URL state, server cache, global UI store, or local state strictly based on scope.
#State Architecture#Zustand#TanStack Query#Senior
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