Your request to control hardware via JavaScript poses at the very least, a security risk. Is JavaScript required for some reason? Are you looking for a web interface to send print jobs? I am certain This can be done with standard Linux system commands, I can write a wrapper for this in C/C++ if you would like. Is this a project to control one, or more of the Epson printers concurrently? Are you looking for features beyond that of standard label printing? Is this job request for an interface or just a means to print via a "epson thermal printer T88 V" I should expect to receive an exact hardware model for testing.