A mobile app (Android, iOS) node js content service that uses RESTbase - Deprecated since 06 July 2023 and superseded by Page Content Service. To be decommissioned.
See https://www.mediawiki.org/wiki/Wikimedia_Apps/Team/RESTBase_services_for_apps
Use https://www.mediawiki.org/wiki/Talk:Content_Transform_Team for any questions about deprecation and decommission.