voluptasmollitia/docs-exp/app.initializeapp_1.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/app](./app.md) &gt; [initializeApp](./app.initializeapp_1.md)

## initializeApp() function

Creates and initializes a FirebaseApp instance.

<b>Signature:</b>

```typescript
export declare function initializeApp(options: FirebaseOptions, config?: FirebaseAppConfig): FirebaseApp;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  options | [FirebaseOptions](./app.firebaseoptions.md) | Options to configure the app's services. |
|  config | [FirebaseAppConfig](./app.firebaseappconfig.md) | FirebaseApp Configuration |

<b>Returns:</b>

[FirebaseApp](./app.firebaseapp.md)