The web app is primarily built with plain JavaScript.

It also utilizesEmby.ApiClient.Javascript for all communication with Emby server.

If you'd like to contribute, here is the procedure to follow. This works both when running from source and using the installed Emby Server.

Clone themaster branch of this repository:

https://github.com/MediaBrowser/emby-web-mobile

Note - when you clone, make sure to specifically indicate the master branch

Shutdown the server, open the system configuration file, and set the set theDashboardSourcePath configuration setting to the src sub-directory of the web app repository that you just cloned.

You'll also want to setEnableDashboardResponseCaching to false. Without this you'll have to clear your browser cache in between testing changes.

Once complete you'll be able to keep the server running, modify source files and simply refresh the browser.