# General Translation React SDKs (gt-react, gt-next, gt-react-native): App Router static site generation
URL: https://generaltranslation.com/en-US/docs/react/nextjs/app-router-static-site-generation.mdx
---

title: App Router static site generation
description: How to pre-render localized Next.js App Router pages with General Translation.
related:
  links:
    - /docs/react/nextjs/app-router-middleware
    - /docs/react/nextjs/registering-request-locales
    - /docs/react/nextjs/cache-components
    - /docs/react/nextjs/locale-alias-seo

---

Pre-render one App Router route per locale with `generateStaticParams`. Locale routing and request locale resolution use the same setup as dynamic routes.

## Keep your Next.js config [#config]

Static generation does not change your `withGTConfig` setup:

```ts title="next.config.ts"
import type { NextConfig } from 'next';
import { withGTConfig } from 'gt-next/config';

const nextConfig: NextConfig = {};

export default withGTConfig(nextConfig);
```

## Configure locale routing [#routing]

Follow the [App Router middleware guide](/docs/react/nextjs/app-router-middleware) to create `proxy.ts`, move your routes under `app/[locale]`, and define the custom [`getLocale`](/docs/react/nextjs/reference/functions/get-locale) function.

## Disable region detection [#region]

The default region resolver reads a cookie, which makes the route dynamic. Add `getRegion.ts` at your project root to disable region detection during prerendering:

```ts title="./getRegion.ts"
export default async function getRegion() {
  return undefined;
}
```

`withGTConfig` detects this file automatically.

## Generate locale routes [#generate-routes]

Return one route parameter for every configured locale:

```tsx title="app/[locale]/page.tsx"
import { getLocales, T } from 'gt-next';

export function generateStaticParams() {
  return getLocales().map((locale) => ({ locale }));
}

export default function HomePage() {
  return <T>Welcome to our site</T>;
}
```

Next.js now pre-renders `app/[locale]/page.tsx` once for each locale.

<Callout type="warn">
  This setup can prerender pages while still deploying a Next.js server. A project with `output: 'export'` cannot build while `proxy.ts` or `middleware.ts` is present. Remove the middleware, export `dynamicParams = false`, generate every locale path, and link directly to those paths for a fully static export; locale detection and redirects will be unavailable.
</Callout>

## Check Next.js compatibility [#compatibility]

The custom `getLocale.ts` file needs access to the root `[locale]` parameter during prerendering. Use the API available in your Next.js version:

| Next.js version | Root locale API |
| --- | --- |
| 15.5 and later | `locale()` from `next/root-params` |
| 15.2.0 and 15.2.3–15.4 | `unstable_rootParams()` from `next/server` |
| Earlier than 15.2 | Upgrade before using this App Router SSG setup |

`gt-next` excludes Next.js 15.2.1 and 15.2.2 from its supported peer range. Upgrade those releases to 15.2.3 or later.

For Next.js 15.2.0 or 15.2.3–15.4, use:

```ts title="./getLocale.ts"
import { unstable_rootParams } from 'next/server';

export default async function getLocale() {
  const params = await unstable_rootParams();
  return params?.locale;
}
```

Keep the Next.js 15.5-and-later `next/root-params` example from the [middleware guide](/docs/react/nextjs/app-router-middleware#root-locale) for current projects.

## Recover from build failures [#build-failures]

### No locale could be determined

Middleware does not run while Next.js prerenders a page. Confirm that `getLocale.ts` exists at the project root or that [`getLocalePath`](/docs/react/nextjs/config#request-function-paths) points to it.

If an arbitrary route value should produce a 404 instead of the default-locale fallback, validate the `[locale]` parameter with [`isLocaleSupported`](/docs/react/nextjs/reference/functions/is-locale-supported).

### `DYNAMIC_SERVER_USAGE`

This error means static rendering reached a dynamic request API. Check that:

- `getLocale.ts` reads only the root route parameter.
- `getRegion.ts` returns a fixed value or `undefined`.
- Neither function calls `headers()` or `cookies()`.

If Cache Components are enabled, also follow the stricter [Cache Components setup](/docs/react/nextjs/cache-components).

### Root parameter export errors

An error that says the `locale` export does not exist usually means the project uses the wrong API for its Next.js version. Follow the [compatibility table](#compatibility).

The `[locale]` segment must also be the first dynamic segment in the App Router tree. Put the root layout at `app/[locale]/layout.tsx`; a layout above that segment cannot read the root locale during prerendering.

### Metadata image routes

Open Graph, Twitter, icon, and Apple icon files are Route Handlers internally and cannot read `next/root-params`. Read `params.locale` and call [`registerLocale`](/docs/react/nextjs/reference/functions/register-locale) before other server helpers. See [Registering request locales](/docs/react/nextjs/registering-request-locales#metadata-images).

## Next steps

- /docs/react/nextjs/app-router-middleware
- /docs/react/nextjs/registering-request-locales
- /docs/react/nextjs/cache-components
- /docs/react/nextjs/locale-alias-seo