Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
VK is a Russian online social media and social networking service.
Vue.js is an open-source model–view–viewmodel JavaScript framework for building user interfaces and single-page applications.