voluptasmollitia/docs-exp/auth.auth.languagecode.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/auth](./auth.md) &gt; [Auth](./auth.auth.md) &gt; [languageCode](./auth.auth.languagecode.md)

## Auth.languageCode property

The Auth instance's language code.

<b>Signature:</b>

```typescript
languageCode: string | null;
```

## Remarks

This is a readable/writable property. When set to null, the default Firebase Console language setting is applied. The language code will propagate to email action templates (password reset, email verification and email change revocation), SMS templates for phone authentication, reCAPTCHA verifier and OAuth popup/redirect operations provided the specified providers support localization with the language code specified.