veritatisdoloremque/docs-exp/auth-types.multifactorassertion.factorid.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/auth-types](./auth-types.md) &gt; [MultiFactorAssertion](./auth-types.multifactorassertion.md) &gt; [factorId](./auth-types.multifactorassertion.factorid.md)

## MultiFactorAssertion.factorId property

The identifier of the second factor.

<b>Signature:</b>

```typescript
readonly factorId: FactorId;
```