Bind data in JavaScript Node-Express

Is there nice way to bind data - one object properties into another in JS and Node(Express) like there is in Groovy/Grails (i.e. user = commandObj.properties). So for, i found the following way, however. It seems taking too many lines of code that could be one liner.

for(var key in user){
    if (user.hasOwnProperty(key)) {
        user[key] = commandObj[key];
        console.log(key + ':' + user[key]);
    }
}

Thank you