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

Monorepo for the Firebase JavaScript SDK

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

## UserCredential.providerId property

The provider which was used to authenticate the user.

<b>Signature:</b>

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