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What a hydration error means
Next.js prerenders HTML on the server, then React hydrates it in the browser by attaching event handlers. For hydration to work, the component tree and content from the browser’s initial render must agree with the prerendered HTML. If they differ, React reports a hydration mismatch. See the Next.js hydration error reference.
This applies to both routers: Pages Router pages are prerendered by default, and in the App Router, Client Components are also prerendered on an initial visit. A "use client" boundary enables client-side features; it is not permission for the initial browser output to differ from the server output. The Next.js Server and Client Components guide notes that Client Components are rendered entirely on the client during subsequent navigations.
Find the first mismatch
- Read the complete browser warning. Note the route, element, and value it identifies. Reproduce the issue with the same route, data, and browser or device when possible.
- Compare the server value with the initial browser value. Look at the rendered HTML and the component’s first-render logic; do not compare against what the page looks like after effects have run.
- Check markup validity first. Look for nested paragraphs, a
<div>inside a<p>, or nested interactive elements such as links and buttons. Invalid nesting can cause the browser to parse a DOM tree different from the one React expects. - Search render code for environment-dependent values. Inspect uses of
typeof window,window,localStorage, current-time reads such asDate(), andMath.random(). Ask whether the server and browser can produce different output from the same component on its first render. - Check changes outside the component. Try a clean browser profile or disable extensions that modify pages. Review CSS-in-JS setup against the official integration guidance for your installed Next.js version, and check whether a CDN feature such as Cloudflare Auto Minify transforms HTML.
Fix common causes
Correct invalid HTML nesting
Restructure the JSX so the generated HTML follows valid nesting rules. For example, do not place a paragraph inside another paragraph or a block-level <div> inside a paragraph. Avoid nesting interactive controls. The browser may repair invalid markup while parsing it, leaving React to hydrate a DOM that no longer matches its expected tree.
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Move browser-only reads out of the initial render
Code such as typeof window !== 'undefined' inside render can make the server and browser return different markup. Likewise, browser APIs such as window and localStorage should not determine server-rendered output. When the value is needed only in the browser, read it in an effect or in response to an event, then update the UI after hydration.
"use client";
import { useEffect, useState } from "react";
export function SavedSetting() {
const [setting, setSetting] = useState(null);
useEffect(() => {
setSetting(window.localStorage.getItem("setting"));
}, []);
return <p>{setting ?? "Loading setting…"}</p>;
}The initial server and browser output in this example is the same placeholder; the browser-specific value appears after the effect runs. Choose a placeholder that makes sense for your interface, and account for the possibility that the stored value is absent.
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Handle current time and randomness deliberately
A timestamp or random value can differ between server prerendering and browser hydration. If that content can wait, render a stable fallback first and reveal the dynamic value after hydration. For supported prerender cases involving these APIs, Next.js documents fallback-boundary and effect or event-handler approaches in its guides for current-time access and random values. Use the pattern that matches the component and the installed Next.js version rather than generating a different value in each initial render.
Account for browser or infrastructure mutations
Browser extensions can alter HTML before React hydrates it. On iOS, automatic detection can turn phone numbers, email addresses, dates, or addresses into links; if that is the cause, Next.js documents using a format-detection meta tag to disable the relevant conversion. Also inspect HTML-changing CDN settings and styling-library configuration. Match the CSS-in-JS setup to the official instructions for your Next.js version instead of changing markup to work around a style configuration issue.
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When to disable prerendering for a component
If a component genuinely cannot render meaningfully without browser APIs, isolate that component and selectively disable its prerendering. This is a scoped option for browser-dependent UI, not a general fix for every hydration warning. Keeping the rest of the page prerendered avoids giving up server rendering more broadly than necessary. Follow the applicable Next.js guidance for the installed version.
Use warning suppression only for a narrow, unavoidable difference
suppressHydrationWarning is an escape hatch for a localized mismatch, such as text that necessarily differs between server and browser. Next.js says it works one level deep; when applied, React will not patch mismatched text. It does not make the underlying output consistent or repair arbitrary tree differences, so first fix the source whenever possible. Use suppression only when the difference is intentional and cannot reasonably be removed.
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Investigate prerender errors during a build
If the problem appears as a build-time prerender error, inspect the build output and use next build --debug-prerender for unminified stack traces with source maps. This command is documented for diagnosing prerender errors; it is not a universal tool for debugging every hydration warning shown in a browser console. See Next.js prerender error guidance.
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Choose the fix by cause
| What differs | First fix to try |
|---|---|
| HTML structure or browser-parsed DOM | Correct invalid nesting and nested interactive elements. |
| Browser API or environment check | Keep the initial output stable; read the browser value in an effect or event handler. |
| Current time or randomness | Use an appropriate stable fallback or defer the value to an effect or event handler. |
| Browser extension, iOS detection, or CDN transformation | Confirm the external mutation, then adjust the relevant browser, metadata, or infrastructure setting. |
| CSS-in-JS mismatch | Verify the integration setup for the installed Next.js version. |
| Component requires browser APIs to render | Isolate it and selectively disable its prerendering. |
| Intentional, unavoidable localized text difference | Consider suppressHydrationWarning narrowly, knowing the text will not be patched. |
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