This is a android spy app, which uploads user data such as contacts, messages, call log, send message(s), photos, videos, open a browser link etc.
Read more here https://students.iitj.ac.in/blog/2018/04/29/android-spy-app-with-socket-io-and-node-js/
Goto https://hawkshaw.tk which is android spy app(v2.0) front end. And let me know about your views. The new version of android spy app is completely build on firebase. So you may not need of any other backend server. So please test my new version of android spy app, with more capabilities and stability.
Android code is written in kotlin Website is running on node.js server