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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
Invalid i18n config
  • 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.
  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.
Next.js Docs: Invalid i18n config
Next.js Invalid i18n config: causes and fixes | Error Atlas