fix(seo): canonical URL, og:locale:alternate, JSON-LD languages, sitemap x-default

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/(frontend)/[locale]/layout.tsx

@@ -21,6 +21,10 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
   const { locale } = await params
   const t = await getTranslations({ locale, namespace: 'meta' })
 
+  const ogLocaleMap: Record<string, string> = { en: 'en_US', fr: 'fr_FR', it: 'it_IT', es: 'es_ES' }
+  const currentOgLocale = ogLocaleMap[locale] ?? 'en_US'
+  const otherOgLocales = Object.values(ogLocaleMap).filter((l) => l !== currentOgLocale)
+
   return {
     metadataBase: new URL(BASE_URL),
     title: {
@@ -31,9 +35,12 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
     openGraph: {
       type: 'website',
       siteName: t('siteName'),
-      locale: ({ en: 'en_US', fr: 'fr_FR', it: 'it_IT', es: 'es_ES' } as Record<string, string>)[locale] ?? 'en_US',
+      locale: currentOgLocale,
       images: [{ url: '/images/og-default.png', width: 1200, height: 630 }],
     },
+    other: {
+      'og:locale:alternate': otherOgLocales,
+    },
     twitter: {
       card: 'summary_large_image',
     },
@@ -41,16 +48,6 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
       index: true,
       follow: true,
     },
-    alternates: {
-      canonical: BASE_URL,
-      languages: {
-        'en': BASE_URL,
-        'fr': `${BASE_URL}/fr`,
-        'it': `${BASE_URL}/it`,
-        'es': `${BASE_URL}/es`,
-        'x-default': BASE_URL,
-      },
-    },
   }
 }
 
@@ -75,6 +72,12 @@ const organizationJsonLd = {
     email: 'hello@letsbe.biz',
     contactType: 'customer service',
   },
+  availableLanguage: [
+    { '@type': 'Language', name: 'English', alternateName: 'en' },
+    { '@type': 'Language', name: 'French', alternateName: 'fr' },
+    { '@type': 'Language', name: 'Italian', alternateName: 'it' },
+    { '@type': 'Language', name: 'Spanish', alternateName: 'es' },
+  ],
 }
 
 export default async function LocaleLayout({ children, params }: Props) {

src/app/(frontend)/[locale]/page.tsx

@@ -38,17 +38,18 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
   }
 }
 
+export default async function HomePage({ params }: Props) {
+  const { locale } = await params
+  setRequestLocale(locale)
+
   const websiteJsonLd = {
     '@context': 'https://schema.org',
     '@type': 'WebSite',
     name: 'LetsBe.',
     url: BASE_URL,
+    inLanguage: locale,
   }
 
-export default async function HomePage({ params }: Props) {
-  const { locale } = await params
-  setRequestLocale(locale)
-
   return (
     <main>
       <script

src/app/sitemap.ts

@@ -19,6 +19,7 @@ export default function sitemap(): MetadataRoute.Sitemap {
         fr: `${BASE_URL}/fr${route}`,
         it: `${BASE_URL}/it${route}`,
         es: `${BASE_URL}/es${route}`,
+        'x-default': `${BASE_URL}${route}`,
       },
     },
   }))
@@ -34,6 +35,7 @@ export default function sitemap(): MetadataRoute.Sitemap {
         fr: `${BASE_URL}/fr/work/${slug}`,
         it: `${BASE_URL}/it/work/${slug}`,
         es: `${BASE_URL}/es/work/${slug}`,
+        'x-default': `${BASE_URL}/work/${slug}`,
       },
     },
   }))