Fumadocs is not a full-powered i18n library, it manages only its own components and utilities.
You can use other libraries like next-intl for the rest of your app.
Read the Next.js Docs to learn more about implementing I18n in Next.js.
Manual Setup
Define the i18n configurations in a file, we will import it with
@/ilb/i18n
in this guide.
Pass it to the source loader.
import { i18n } from '@/lib/i18n';import { loader } from 'fumadocs-core/source';export const source = loader({ i18n, // other options});
And update Fumadocs UI layout options.
import { i18n } from '@/lib/i18n';import type { BaseLayoutProps } from 'fumadocs-ui/layouts/shared';export function baseOptions(locale: string): BaseLayoutProps { return { i18n, // different props based on `locale` };}
Middleware
Create a middleware that redirects users to appropriate locale.
Note that this is optional, you can also use your own middleware or the one provided by i18n libraries.
Routing
Create a
/app/[lang]
folder, and move all files (e.g.
page.tsx
,
layout.tsx
) from
/app
to the folder.
Wrap the root provider inside
I18nProvider
, and provide available languages & translations to it.
Note that only English translations are provided by default.
import { RootProvider } from 'fumadocs-ui/provider';import { I18nProvider, type Translations } from 'fumadocs-ui/i18n';const cn: Partial<Translations> = { search: 'Translated Content', // other translations};// available languages that will be displayed on UI// make sure `locale` is consistent with your i18n configconst locales = [ { name: 'English', locale: 'en', }, { name: 'Chinese', locale: 'cn', },];export default async function RootLayout({ params, children,}: { params: Promise<{ lang: string }>; children: React.ReactNode;}) { const lang = (await params).lang; return ( <html lang={lang}> <body> <I18nProvider locale={lang} locales={locales} translations={{ cn }[lang]} > <RootProvider>{children}</RootProvider> </I18nProvider> </body> </html> );}
Pass Locale
Pass the locale to Fumadocs in your pages and layouts.
Search
Configure i18n on your search solution.
Built-in Search (Orama):
For Supported Languages, no further changes are needed.
Otherwise, additional config is required (e.g. Chinese & Japanese). See Special Languages.
Cloud Solutions (e.g. Algolia):
They usually have official support for multilingual.
Writing Documents
Navigation
Fumadocs only handles navigation for its own layouts (e.g. sidebar).
For other places, you can use the
useParams
hook to get the locale from url, and attend it to
href
.
import Link from 'next/link';import { useParams } from 'next/navigation';const { lang } = useParams();return <Link href={`/${lang}/another-page`}>This is a link</Link>;
