AngularJS is an open-source JavaScript-based front-end web framework maintained by Google and some other developer communities. The framework aims to simplify the development and testing of single-page applications. AngularJS framework provides a client-side model-view-controller (MVC) and model-view model (MVVM) architectures along with high functioning components commonly used in complex internet applications.

Angular JS forms the frontend part of the MEAN stack with MongoDB database and ExpressJS web application server framework and NodeHS server runtime environment.