Answer 1

Install Termux app, setup node web server there

Answer 2

Runtime Terror use json server
https://github.com/typicode/json-server

Answer 3

Runtime Terror phone applications are run from apps, what do you mean "without installing any app"? How could Nodejs being installed into the phone without using any apps?

Answer 4

Use pouch database
Maybe works!
i heard it works offline

Answer 5

Yeah as calvin said use termux