When choosing a name for a new event, follow these rules:
- Event names are case sensitive. For example,
my_eventandMy_Eventare distinct events. - Event names can include English and non-English words and letters.
- Do not use reserved prefixes and event names.
- Event names must start with a letter. Use only letters, numbers, and underscores. Don't use spaces.
Reserved prefixes and event names
The following list is not exhaustive and may be updated periodically. If you try to use a reserved prefix or name, Analytics will display an error message.
Web
Reserved event names
The following event names are reserved and cannot be used:
- app_remove
- app_store_refund
- app_store_subscription_cancel
- app_store_subscription_renew
- click
- error
- file_download
- first_open
- first_visit
- form_start
- form_submit
- in_app_purchase
- page_view
- scroll
- session_start
- user_engagement
- view_complete
- video_progress
- video_start
- view_search_results
Reserved parameter names
The following parameter names are reserved and cannot be used:
- engagement_time_msec
- gclid
- session_id
- session_number
Additionally, parameter names cannot begin with:
- _ (underscore)
- firebase_
- ga_
- google_
- gtag.
Reserved user property names
The following user property names are reserved and cannot be used:
- first_open_time
- first_visit_time
- last_deep_link_referrer
- user_id
- first_open_after_install
Additionally, user property names cannot begin with:
- _ (underscore)
- firebase_
- ga_
- google_
Mobile (Android and iOS)
Reserved event names
The following event names are reserved and cannot be used:
- ad_activeview
- ad_click
- ad_exposure
- ad_impression
- ad_query
- ad_reward
- adunit_exposure
- app_clear_data
- app_exception
- app_install
- app_remove
- app_store_refund
- app_update
- app_upgrade
- dynamic_link_app_open
- dynamic_link_app_update
- dynamic_link_first_open
- error
- firebase_campaign
- firebase_in_app_message_action
- firebase_in_app_message_dismiss
- firebase_in_app_message_impression
- first_open
- first_visit
- in_app_purchase
- notification_dismiss
- notification_foreground
- notification_open
- notification_receive
- notification_send
- os_update
- screen_view
- session_start
- user_engagement
Reserved parameter names
The following parameter names are reserved and cannot be used:
- firebase_conversion
Additionally, parameter names cannot begin with:
- _ (underscore)
- firebase_
- ga_
- google_
- gtag.
Reserved user property names
The following user property names are reserved and cannot be used:
- first_open_time
- first_visit_time
- last_deep_link_referrer
- user_id
- first_open_after_install
Additionally, user property names cannot begin with:
- _ (underscore)
- firebase_
- ga_
- google_