Frontend State Management: Why Mixing Server, URL, and UI State Breaks Apps

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A technical analysis argues that the core value of modern frontend engineers lies not in writing code but in making system design decisions about data ownership and state distribution. The article identifies three distinct state categories — Server State, Client State, and URL State — and warns that blending them into a single store causes bugs like stale data, lost navigation context after page refresh, and bloated global memory. Common patterns such as storing API responses in React's useState are cited as architectural errors rather than mere style issues. Dedicated tools like TanStack Query, SWR, and Next.js Data Caching are recommended for server state, while URL parameters and lightweight hooks are advised for navigation and ephemeral UI state respectively. The piece frames state management as a data distribution problem that AI models cannot reliably solve for product-specific contexts.

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