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React 19 Is Stable: The Upgrade That Quietly Changes App Architecture

React 19 stabilizes Suspense-first patterns, server flows, and upgrade guidance for React 18 apps.

5 min read Updated 2025

React 19 cements modern Suspense and server-first patterns. Upgrades mean revisiting routing, data fetching, and third-party libs.

Migration risk radar
  • Routing: medium.
  • Data fetching: medium-high.
  • Suspense: review usage.
  • SSR: verify adapters.

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