voluptasmollitia/docs-exp/auth.recaptchaverifier._constructor_.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/auth](./auth.md) &gt; [RecaptchaVerifier](./auth.recaptchaverifier.md) &gt; [(constructor)](./auth.recaptchaverifier._constructor_.md)

## RecaptchaVerifier.(constructor)

Constructs a new instance of the `RecaptchaVerifier` class

<b>Signature:</b>

```typescript
constructor(containerOrId: HTMLElement | string, parameters: Parameters, authExtern: Auth);
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  containerOrId | HTMLElement \| string | The reCAPTCHA container parameter. |
|  parameters | Parameters | The optional reCAPTCHA parameters. |
|  authExtern | [Auth](./auth.auth.md) | The corresponding Firebase Auth instance. |

## Remarks

If none is provided, the default Firebase Auth instance is used. A Firebase Auth instance must be initialized with an API key, otherwise an error will be thrown.