[Home](./index.md) > [@firebase/auth-types](./auth-types.md) > [ActionCodeURL](./auth-types.actioncodeurl.md) > [languageCode](./auth-types.actioncodeurl.languagecode.md) ## ActionCodeURL.languageCode property The language code of the email action link. Null if not provided. Signature: ```typescript readonly languageCode: string | null; ```