Can I host my front end in one hosting service and the backend somewhere else?

Can I host my front end in one hosting service and the backend somewhere
else?

I have a website hosted in justhost.com. So far it is only HTML/CSS/JS
done all from scratch. Recently I have been learning about Server Side
Java Script (SSJS) using nodejs and I would like to add some JS backend
processing to my site. The problem is that justhost.com does not seem to
support nodejs applications, so now I am kind of stuck.
Is there a way to keep all the front end of my site (HTML, CSS and front
end JS) hosted in justhost.com and then build the backend in nodejs SSJS
and keep that part hosted in another service or server and somehow make it
all work together?
Right not it is not a commercial application, so I can play around and
break things, so I am open to any suggestion.
Thanks in advance.