How to fix RSC hydration mismatches in Next.js
SMRTR summary
Hydration mismatches in React Server Component apps are easy to overlook but costly — they can silently discard server-rendered work and undermine streaming performance. This guide covers the six most common causes in Next.js App Router apps (browser APIs, timezones, auth state, invalid HTML, extensions, CSS-in-JS), plus a structured production debugging workflow using instrumentation, Suspense isolation, and HTML diffing.
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