Update data on a page without refreshing

I’m trying to do update data on a page without refreshing.when insert the value from backend and without refresh or reload i want to show my updated data into my app.how can i do that?

The way you describe this sounds like a logical impossibility the way I understand the typical use of the word “reload”, but all I can say at this point is that you should familiarize yourself with the fundamental concepts of rxjs.