> For the complete documentation index, see [llms.txt](https://docs-jmapserver-lima.k2geospatial.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-jmapserver-lima.k2geospatial.com/e/administrator/jmap-server-administrator-manual/jmap-server-extensions.md).

# JMap Server Extensions

JMap standard features can be extended to provide new specialized functions. This is done using JMap extensions. 

A JMap extension is an optional module that can be plugged into JMap Server and/or JMap applications in order to provide the desired set of new functions. 

The extensions installed in your JMap Server are displayed in the [Installed Extensions](/e/administrator/jmap-server-administrator-manual/jmap-server-extensions/installed-extensions.md) section.

 The available extensions are presented in the [Marketplace](/e/administrator/jmap-server-administrator-manual/jmap-server-extensions/marketplace.md) of the **Extensions** section.

Organizations can also develop their own extensions using the [JMap Server SDK](https://docs-jmapserver-lima.k2geospatial.com/v/jmapserversdk).