voluptasmollitia/docs-exp/database.getdatabase.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/database](./database.md) &gt; [getDatabase](./database.getdatabase.md)

## getDatabase() function

Returns the instance of the Realtime Database SDK that is associated with the provided [FirebaseApp](./app.firebaseapp.md)<!-- -->. Initializes a new instance with with default settings if no instance exists or if the existing instance uses a custom database URL.

<b>Signature:</b>

```typescript
export declare function getDatabase(app?: FirebaseApp, url?: string): FirebaseDatabase;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  app | FirebaseApp | The [FirebaseApp](./app.firebaseapp.md) instance that the returned Realtime Database instance is associated with. |
|  url | string | The URL of the Realtime Database instance to connect to. If not provided, the SDK connects to the default instance of the Firebase App. |

<b>Returns:</b>

[FirebaseDatabase](./database.firebasedatabase.md)

The `FirebaseDatabase` instance of the provided app.