Error AtlasError Documentation and Resolution
Back to searchMore Next.js errors

Next.js

Next.js invalid i18n configuration

Invalid i18n config

Next.js found an invalid i18n configuration in next.config.js, such as an unsupported shape, too many locales, or inconsistent domain settings.

Invalid i18n configconfiguration

Observed message

Invalid i18n config

Why it happens

  • The i18n field does not follow the expected next.config.js shape.
  • The locale count exceeds supported limits.
  • Domain routing values are incomplete or inconsistent with locale configuration.

How to fix it

  1. Validate locales, defaultLocale, and domains against the documented i18n config shape.
  2. Reduce oversized locale lists to supported limits.
  3. Check that every domain routing entry includes the correct default locale and optional locale list.

Official reference

Next.js Docs: Invalid i18n config

Related errors

Invalid next.config.jsNext.js configuration contains invalid optionsnext.config.js Loading ErrorNext.js could not load next.config.jsInvalid images configNext.js invalid images configurationInvalid Layout or Page ExportNext.js invalid layout or page export

Explore more

Next.jsBrowse more Next.js errorsconfigurationBrowse more configuration errors
Next.js Invalid i18n config: causes and fixes | Error Atlas