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Fix React and Next.js Hydration Mismatch Errors

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-19

Causes and fixes for React and Next.js hydration mismatches: random values, dates and locale, window and localStorage access, invalid HTML nesting, browser extensions, and when to use effects or suppressHydrationWarning.

The page flashes, or the console says "Hydration failed because the server rendered HTML didn't match the client". Find what differs between server and browser output and make it identical on first render.

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#react#nextjs#hydration#ssr#debugging

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