how do I pipe input to stdin of already running application in windows

I've created an app that is waiting on input from stdin it's a node application running on the windows OS,

I've got an event externally and I want to send input into my already running node application (there should only ever be one instance of the node application) how do I perform this in windows without opening a new instance of the node app?

Ideally I'd like to do this in .bat/cmd line code but if it's not possible a node solution is preferable, that said I'd try my best to implement any solutions that you may have for this