How to looping through array in express js (nodejs)

i have been trying to loop some variable my express, many thing i have manipulated and do some browsing but still not looking for solving.

here is my variable

var data = {
    response : 1,
    messages : "found the result",
    data : rows
};

how do i loop that? by the way forget about rows, it is the rows after i query the database.

i've been trying this looping

 for(var i in data){
    console.log(data[i]);
 }

via Abdan Syakuro