How to properly redirect to Node.js?

Question

Node.js

The user enters the main page, the server checks whether he is authorized, if not, then you need to redirect to the /login page. How can this be done without js instructions on the client? Maybe some headings?
Or do you need to provide a script on the client in advance, and with the appropriate command from the server, make a redirect with a client javascript?

Answer 1

Create a checkuser endpoint on the back or request an accesstoken. According to the results that came with the API, make a redirect on the client side, it will be more correct.