The basic launchpad node app

app.js

var midiConnector = require('midi-launchpad').connect(midiport);

// wait for the connector to be ready
midiConnector.on("ready",function(launchpad) {
  launchpad.on("press", function(button){
    button.light(launchpad.colors.green.high);
  });
  launchpad.on("release", function(button) {
    button.light(launchpad.colors.off);
  });
});