I want to show real time push notification to every user if someone started any kind off process. My project is in Angular and Node JS. If any user start some process then every user in the site should be notified by push notification
For the server side you would need a socket solution to enable real time notification.
Since you are using WEBSOCKETS as the backend, you can try socket.io . Personally, I find them quite easy to use. Their documentation can be found through their site.
If you need a step by step guide on how to combine nodeJS + socket.io + Angular, you can refer to this guide from DigitalOcean
https://www.digitalocean.com/community/tutorials/angular-socket-io
On the angular side, you need to develop a way to ensure that all users consume the notification. Two simple methods on this could
either through your state administration such as NGRX,
or through a global service