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How do I migrate a React SPA to Next.js App Router?
Next.js’s migration guidance for Vite and Create React App recommends first getting the existing application running, then adopting Next.js capabilities incrementally. The Vite guide starts by keeping the app client-side and retaining its existing router; the Create React App guide describes a similar client-only bridge. This lets a team establish a working Next.js shell before changing routing or rendering assumptions across the application.
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- Bring up the shell. Embed the existing app as a client-only entry point and keep its current router initially. The Next.js SPA migration guidance uses
next/dynamicwith{ ssr: false }to prevent a selected legacy component from being prerendered. - Inventory one route or feature at a time. As an engineering recommendation, record each slice’s routing behavior, browser API usage, data dependencies, authentication needs, and whether it must render on the server.
- Choose the rendering model for that slice. Keep browser-dependent interaction in Client Components; move suitable data and presentation work to Server Components where that fits the route.
- Adopt App Router routing and server capabilities incrementally. The migration guide describes moving from React Router to App Router to use file-based routing, automatic code splitting, streaming server rendering, and React Server Components.
- Validate each slice before moving the next one. Check the route’s initial HTML and browser behavior, including authentication and any browser-only dependencies, before expanding the migration boundary.
The first step is a bridge, not the final architecture. Keeping the whole legacy app client-only indefinitely preserves its client-heavy behavior; use that stage to reduce migration risk while the team identifies which routes are ready for App Router rendering.
What changes when App Router renders a page?
App Router pages and layouts are Server Components by default. On an initial page load, Server Components produce a React Server Component payload, which Next.js uses to reconcile the component tree. Client Components are also prerendered to HTML for that initial response, and JavaScript hydrates them in the browser. On later navigations, Client Components render on the client.
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That is why 'use client' does not mean “this component never runs during server rendering.” It marks a boundary in the module graph: imports and descendants below it become part of the client bundle. Place the directive around the interaction or browser API that needs it rather than at the top of a broad tree, so unrelated code does not cross the boundary unnecessarily.
The migration guide’s dynamic-import pattern with { ssr: false } is useful when a particular legacy component fundamentally requires the browser. Treat it as a targeted exception, not as a reason to disable prerendering for every route.
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Why am I getting a hydration error?
A hydration mismatch means the browser’s first render does not match the React tree that produced the prerendered HTML. React cannot reliably attach the expected behavior when those initial outputs diverge. Next.js’s hydration guidance identifies these common causes:
- Invalid or improperly nested HTML, such as nested paragraph elements or interactive elements nested inside the same kind of interactive element.
- Render-time environment branches, such as checking
typeof window !== 'undefined'and returning different markup on the server and browser. - Browser-only APIs, including
windoworlocalStorage, used while rendering. - Time-dependent output, such as a timestamp generated during render.
- Browser extensions that change the page’s HTML.
- Incorrect CSS-in-JS configuration.
- An edge or CDN layer that modifies the HTML response; the documentation gives Cloudflare Auto Minify as an example.
How do I find the source of a hydration mismatch?
Use the mismatch as a clue to locate the first output that differs, rather than suppressing the warning before identifying its cause. A practical diagnostic order, based on the causes Next.js documents, is:
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- Read the mismatch diff and identify the component or text whose initial output diverges.
- Inspect the generated markup around that output for invalid nesting or duplicate interactive elements.
- Check render logic for environment branches, browser storage, browser globals, clocks, randomness, or other values that can differ between server and browser.
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This order is a debugging approach, not a guarantee that every mismatch has one of these causes. The useful starting point is the actual divergent output.
How do I fix a hydration mismatch?
Choose the fix according to what the UI should show on the initial load:
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- The initial content should be identical: make the server render and the browser’s first render use the same input and produce the same markup.
- The value exists only in the browser: render a stable initial state, then read the browser API or update the display in
useEffect. Effects run after hydration, so the browser-only change does not alter the initial tree. - The component fundamentally requires the browser: use a targeted dynamic import with
ssr: falseso that component is not prerendered. - A small text difference cannot be avoided:
suppressHydrationWarningis a narrow escape hatch. It applies one level deep, and React does not patch mismatched text content when it is set; do not use it to hide wider structural divergence.
Handle clocks according to the intended behavior
Timestamps, relative-time labels, and current-year values can change between prerendering and hydration simply because time has passed. If the value should be cached, evaluated for each request, or updated in the browser, choose a rendering approach that matches that intent. Current Next.js rendering guidance covers cached and request-time rendering as well as browser-side updates. A warning suppression may hide a small unavoidable difference, but it is not a general solution for time-dependent UI.
Should the app remain client-side or adopt App Router capabilities?
| Decision area | Keep the SPA client-side initially | Adopt App Router capabilities incrementally |
|---|---|---|
| Migration risk | Preserves more existing behavior and is the documented starting point in the migration guides. | Introduces server/client boundaries and new routing or data patterns route by route. |
| Initial rendering | Can remain strictly client-side when prerendering is disabled for the legacy app. | Server-rendered HTML and hydration become part of the initial-load contract. |
| Routing | The existing router can remain during initial setup. | Moving to App Router enables file-based routing and its associated capabilities. |
| Server features | Static export does not provide server-side features. | Removing static export permits Next.js server features, subject to deployment setup. |
| Client JavaScript | The legacy app remains client-heavy. | Server Components may reduce client-side work, but the result depends on the application. |
In the Create React App migration path, output: 'export' produces a static export. It is a deployment and capability choice, not just a migration switch: if the application needs server-side features, the guide says to remove that setting. Decide whether those features are needed before choosing a deployment mode.
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App Router offers capabilities, not a guaranteed performance result. The migration and component guidance does not provide a controlled before-and-after benchmark for a particular production SPA, so bundle-size reductions, faster loads, or other gains should be measured in the application rather than assumed.
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