Fix Hydration Mismatch in Next.js: SSR Error Solution (2026)
How to Fix “Hydration Mismatch” in Next.js (2026 Guide) The Short Answer To fix the “Hydration Mismatch” error in Next.js, advanced users can try setting useEffect to false in their component or use the suppressHydrationWarning prop to bypass the error. This will resolve the client-server sync issue and prevent the SSR error from occurring. Why This Error Happens Reason 1: The most common cause of the “Hydration Mismatch” error is a mismatch between the server-rendered HTML and the client-rendered HTML, often due to incorrect usage of useEffect or other side-effect hooks. Reason 2: An edge case cause of this error is when using a third-party library that modifies the DOM in a way that conflicts with Next.js’s hydration process, such as a library that uses document.write. Impact: The “Hydration Mismatch” error results in an SSR error, which can cause the page to fail to render or display incorrect data, leading to a poor user experience. Step-by-Step Solutions Method 1: The Quick Fix Go to next.config.js > experimental section Toggle reactStrictMode to false Refresh the page to see if the error is resolved. Method 2: The Command Line/Advanced Fix To fix the issue programmatically, you can use the suppressHydrationWarning prop on the component that’s causing the error. For example: ...