npm install ecoplugs

var plugs = new EcoPlugGroup(config); // config object described below

plugs.getPowerState(config.plugs[0], (err, state) => {
  if (err) console.log("ERROR: ", err);
  else console.log(state ? "ON" : "OFF");
});

var newState = true; // truthy for on, falsey for off

plugs.setPowerState(config.plugs[0], newState, (err) => {
  if (err) console.log(err);
});

{
    "plugs": [
        {
            "name": "EcoPlug1",
            "host": "192.168.0.xxx",
            "id": "ECO-xxxxxxxx"
        },
        {
            "name": "EcoPlug2",
            "host": "192.168.0.yyy",
            "id": "ECO-yyyyyyyy"                        
        }
    ]
}