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Monorepo for the Firebase JavaScript SDK
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[Home](./index.md) > [@firebase/app-types](./app-types.md) > [FirebaseOptions](./app-types.firebaseoptions.md) > [appId](./app-types.firebaseoptions.appid.md)
## FirebaseOptions.appId property
<b>Signature:</b>
```typescript
appId?: string;
```