Observed Signal · Jun 9, 2026 · Technical Guide · Source: DEV Community · Impact: 1/5 · Sentiment: Neutral
Wiring Sanity Multilingual Content to Next.js
A technical how-to explaining how to integrate Sanity CMS multilingual documents with Next.js using next-intl in the Next.js App Router. The article covers schema design (keeping language-neutral fields on a shared document and translated fields on locale documents), installing and configuring @sanity/document-internationalization, GROQ query patterns filtered by language, using the plugin's _translations metadata to build hreflang alternates, and a custom slug isUnique validator scoped to language to avoid cross-locale collisions. It also shows how to loop over locales in generateStaticParams to ensure static generation of all locale variants and discusses fallback strategies (404, redirect, or show default content). Code samples and concrete queries are provided for production-ready wiring.
Practical developer guidance for implementing multilingual CMS routing and schema in Next.js; useful for publishers and developers but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Sanity's @sanity/document-internationalization plugin creates one document per locale with a shared _id prefix (e.g., page.en, page.fr) and injects a language field.
- Use language == $locale in GROQ queries to fetch locale-specific content and filter out drafts with !(_id in path("drafts.**")).
- The plugin adds translation metadata (_translations) which can be queried to retrieve all locale versions and their slugs for building hreflang alternates.
- Sanity's default slug uniqueness validator checks across all documents; the post provides a custom isUnique function that scopes slug uniqueness to a document's language using client.fetch.
- generateStaticParams must iterate over all locales and fetch slugs per locale to include every locale/slug combination in static generation.
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