[Home](./index.md) > [@firebase/app](./app.md) > [FirebaseOptions](./app.firebaseoptions.md) ## FirebaseOptions interface Firebase configuration object Signature: ```typescript export interface FirebaseOptions ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [apiKey?](./app.firebaseoptions.apikey.md) | string | (Optional) | | [appId?](./app.firebaseoptions.appid.md) | string | (Optional) | | [authDomain?](./app.firebaseoptions.authdomain.md) | string | (Optional) | | [databaseURL?](./app.firebaseoptions.databaseurl.md) | string | (Optional) | | [measurementId?](./app.firebaseoptions.measurementid.md) | string | (Optional) | | [messagingSenderId?](./app.firebaseoptions.messagingsenderid.md) | string | (Optional) | | [projectId?](./app.firebaseoptions.projectid.md) | string | (Optional) | | [storageBucket?](./app.firebaseoptions.storagebucket.md) | string | (Optional) |