Hybrid mobile application frameworks are becoming more and more popular, due to how simple and fast it is to develop a mobile application that will work on multiple platforms. Sometimes, these frameworks don't provide all the functionality that native application development does. Ionic framework doesn't provide a way to establish an HTTPS connection with client authentication. In this thesis, we add an option to use client authentication to an Ionic plugin. We evaluate the plugin by using it in a test application. We also use the plugin in a real-life smart mobile application, that is used for presenting the electric consumption of a specific household, and evaluate it that way also.