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Modernize React

Operational guides for upgrading React: React 19 upgrade hub, version-to-version migration paths, hydration error fixes, and class-to-hooks modernization.

Last verified · Updated May 22, 2026

React's major versions ship real breaking changes — removed APIs, ref behavior, and renderer changes. This hub links every supported upgrade path plus the workflows for the errors those upgrades surface.

What this covers

Start at the React 19 upgrade hub for the full breaking-change picture, then pick the source-to-target page that matches the version you are on today. Each page includes a repo-inspection prompt, step-by-step migration, test plan, and rollback guidance.

Version timeline

  • 19.x — current, active (released 2024-12-05)
  • 18.x — maintenance (released 2022-03-29)
  • 17.x — maintenance (released 2020-10-20)
  • 16.x — eol (released 2017-09-26)

React migration paths

Frequently asked questions

Which React version should I target?

React 19 is the current stable release. If you are on 16 or 17, plan an intermediate stop at 18 to de-risk the concurrent-rendering changes before adopting 19-only APIs.