How to Fix Next.js Hydration Mismatch Errors in App Router

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A common error in Next.js App Router occurs when server-rendered HTML does not match what React tries to hydrate on the client side during initial load. This mismatch is typically caused by using browser-only APIs such as Date(), localStorage, or Math.random() directly inside component render logic. Developers can resolve the issue by using the suppressHydrationWarning attribute for static content, or by deferring client-specific data fetching to a useEffect hook. For components that rely entirely on browser state, Next.js recommends using dynamic imports with the ssr: false option to skip server-side rendering altogether. Additionally, adding a format-detection meta tag in the root layout can prevent iOS from injecting unexpected nodes that also trigger hydration warnings.

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