How to implement a notification system in a nodeJs application?

Question

Node.js

Hello, there is a multi-page application on nodeJs, there is technical support in the application. How can I show a notification in the header of the site after the admin or the system sends a new message to the user?
To store the cache, I use redis, can I do it as an option?

Answer 1

1) websockets
2) setInterval

Answer 2

If everyone needs to be notified, then socket.io and let 's say snackbar (For the message itself).
If not, then just a snackbar.