[Home](./index.md) > [@firebase/analytics](./analytics.md) > [EventParams](./analytics.eventparams.md) ## EventParams interface Standard gtag.js event parameters. For more information, see [the gtag.js documentation on parameters](https://developers.google.com/gtagjs/reference/parameter). Signature: ```typescript export interface EventParams ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [affiliation?](./analytics.eventparams.affiliation.md) | string | (Optional) | | [checkout\_option?](./analytics.eventparams.checkout_option.md) | string | (Optional) | | [checkout\_step?](./analytics.eventparams.checkout_step.md) | number | (Optional) | | [content\_id?](./analytics.eventparams.content_id.md) | string | (Optional) | | [content\_type?](./analytics.eventparams.content_type.md) | string | (Optional) | | [coupon?](./analytics.eventparams.coupon.md) | string | (Optional) | | [currency?](./analytics.eventparams.currency.md) | string | (Optional) | | [description?](./analytics.eventparams.description.md) | string | (Optional) | | [event\_category?](./analytics.eventparams.event_category.md) | string | (Optional) | | [event\_label?](./analytics.eventparams.event_label.md) | string | (Optional) | | [fatal?](./analytics.eventparams.fatal.md) | boolean | (Optional) | | [item\_list\_id?](./analytics.eventparams.item_list_id.md) | string | (Optional) | | [item\_list\_name?](./analytics.eventparams.item_list_name.md) | string | (Optional) | | [items?](./analytics.eventparams.items.md) | [Item](./analytics.item.md)\[\] | (Optional) | | [method?](./analytics.eventparams.method.md) | string | (Optional) | | [number?](./analytics.eventparams.number.md) | string | (Optional) | | [page\_location?](./analytics.eventparams.page_location.md) | string | (Optional) | | [page\_path?](./analytics.eventparams.page_path.md) | string | (Optional) | | [page\_title?](./analytics.eventparams.page_title.md) | string | (Optional) | | [payment\_type?](./analytics.eventparams.payment_type.md) | string | (Optional) | | [promotion\_id?](./analytics.eventparams.promotion_id.md) | string | (Optional) | | [promotion\_name?](./analytics.eventparams.promotion_name.md) | string | (Optional) | | [promotions?](./analytics.eventparams.promotions.md) | [Promotion](./analytics.promotion.md)\[\] | (Optional) | | [screen\_name?](./analytics.eventparams.screen_name.md) | string | (Optional) | | [search\_term?](./analytics.eventparams.search_term.md) | string | (Optional) | | [shipping\_tier?](./analytics.eventparams.shipping_tier.md) | string | (Optional) | | [shipping?](./analytics.eventparams.shipping.md) | [Currency](./analytics.currency.md) | (Optional) | | [tax?](./analytics.eventparams.tax.md) | [Currency](./analytics.currency.md) | (Optional) | | [transaction\_id?](./analytics.eventparams.transaction_id.md) | string | (Optional) | | [value?](./analytics.eventparams.value.md) | number | (Optional) |