voluptasmollitia/docs-exp/installations.getid.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/installations](./installations.md) &gt; [getId](./installations.getid.md)

## getId() function

Creates a Firebase Installation if there isn't one for the app and returns the Installation ID.

<b>Signature:</b>

```typescript
export declare function getId(installations: FirebaseInstallations): Promise<string>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  installations | [FirebaseInstallations](./installations.firebaseinstallations.md) | The <code>Installations</code> instance. |

<b>Returns:</b>

Promise&lt;string&gt;