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React 19+ · Function

hydrate

hydrate attaches React to HTML previously rendered on the server. It is deprecated: React 18 replaced it with hydrateRoot, and React 19 removed it.

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Syntax

hydrate(reactNode, domNode, callback?)

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  • hydrateRoot
  • render
  • createRoot
  • suppressHydrationWarning
  • react-dom/server

Source: hydrate – React. Checked 2026-11-03.