How to run multiple windows in cmd
node.js runs via a command line (no windows involved). If you want to run more than one copy of the same program you can simply start it more that once.
Take this simple one:
https://nodejs.org/en/docs/guides/getting-started-guide/
Since it runs on a dedicated port (3000) if you start it more that once it will fail.
Here is something I found on google that details all the ways to do this:
https://itnext.io/4-solutions-to-run-multiple-node-js-or-npm-commands-simultaneously-9edaa6215a93