I don't know if Zeit Now (while really cool!) would work for NodeBB... NodeBB is a web application, and does lots of stuff in the background that relies on a server running. To have a service that spins up whenever a request comes in would be much too slow, if only because that first spin up would take many seconds!
whenver I am doing ./nodebb status
this is coming : -bash: ./nodebb: Permission denied
hence I am not able to start nodebb
@Abhinov-Singh-0 I suggest learning about solving Linux permissions issues on your own.
For now, I'm guessing you need to make it executable:
chmod +x ./nodebb
It may also be an issue with ownership, in which case you'd use chown.
You can search for any of these topics and find hundreds of tutorials.