Wikibase is a set of MediaWiki extensions for working with versioned semi-structured data in a central repository based upon JSON instead of the unstructured data of MediaWiki wikitext. Its primary components are the ', an extension for storing and managing data, and the ' which allows for the retrieval and embedding of structured data from a wikibase repository. Wikibase was developed for and is used by Wikidata.
The data model for Wikibase links consists of "entities" which include individual "items", labels or identifier to describe them, and semantic statements that attribute "properties" to the item. These properties may either be other items within the database, or textual information.
Wikibase has a JavaScript-based user interface, and provides exports of all or subsets of data in many formats. Projects using it include Wikidata, Europeana's Eagle Project, the Droid Wiki, and the OpenStreetMap wiki.