How to read Array of data from json in javascript

How to read Array of data from json in javascript

How to Iterate Array of data in json Please Check my code
Object {bhanu : Array[3], root: Array[12], hari: Array[7], balu: Array[1],
santha: Array[6]}
I want to Iterate this array How can do this I am using like this
function orgChartResult(result)
{
var userOrgUsers = JSON.parse(result);
for(var name in userOrgUsers) {
console.log(name + "=" + userOrgUsers[name]);
}
console.log(userOrgUsers);
}
but it's give all data .But I want to read firstNode data only Means in
bhanu:Arrat[3]; My array size is 3 then next array size is 12 how can i
read one by one