GeoServer is an open source server developed in Java that allows the users to share and edit geospatial information. Designed for the interoperability, publishes information of any spatial information source using open standards. GeoServer constitutes the OGC Reference implementation for the Web Feature Service standard (WFS). The license model used by GeoServer as well as their architecture allows the extension development using their platform as support. In this way some components can be re-used like the security; the definition and implementation of OGC OWS, and validated implementations of WFS, WCS, WMS and others. This article describes the implementation of the specification for Table Joining Service Service (TJS) of OGC as an extension to the GeoServer platform. This OGC standard defines a simple way to describe and to exchange information stored in data sources not spatial that contains information related to geographical objects.