voluptasmollitia/docs-exp/auth.additionaluserinfo.providerid.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/auth](./auth.md) &gt; [AdditionalUserInfo](./auth.additionaluserinfo.md) &gt; [providerId](./auth.additionaluserinfo.providerid.md)

## AdditionalUserInfo.providerId property

Identifier for the provider used to authenticate this user.

<b>Signature:</b>

```typescript
readonly providerId: string | null;
```