voluptasmollitia/docs-exp/auth.idtokenresult.signinsecondfactor.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/auth](./auth.md) &gt; [IdTokenResult](./auth.idtokenresult.md) &gt; [signInSecondFactor](./auth.idtokenresult.signinsecondfactor.md)

## IdTokenResult.signInSecondFactor property

The type of second factor associated with this session, provided the user was multi-factor authenticated (eg. phone, etc).

<b>Signature:</b>

```typescript
signInSecondFactor: string | null;
```