[Home](./index.md) > [@firebase/analytics](./analytics.md) > [SettingsOptions](./analytics.settingsoptions.md) ## SettingsOptions interface Specifies custom options for your Firebase Analytics instance. You must set these before initializing `firebase.analytics()`. Signature: ```typescript export interface SettingsOptions ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [dataLayerName?](./analytics.settingsoptions.datalayername.md) | string | (Optional) Sets custom name for dataLayer array used by gtag. | | [gtagName?](./analytics.settingsoptions.gtagname.md) | string | (Optional) Sets custom name for gtag function. |