Need to Iterate JSON object

Need to Iterate JSON object

I  have a JSON object:
users:[ 
user{
{      emailAddress :  "none"
  1. firstName: "na"
  2. globalId: "testus1"
  3. lastName: "TestUS1"
  4. selectedDuties: "User" },
  5. { 
    1. emailAddress: "none"
    2. firstName: "na"
    3. globalId: "testus2"
    4. lastName: "TestUS2"
    5. selectedDuties: "User"
    }
  6. }
  7. ]

Im trying to do a check based on my global id. But im not able to... 

$.each(data.user,function(index,val){
for (var x=0; x < data.user.length;x++){ 
if ( data.user[x] == "globalId") { 
var actualData ={};
actualData.data=val;
jsObject.json_data.data.push(actualData);
} 
}
}

Here data.user.length gives the value, where as if i check data.user[x] it gives undefined. 
Can any one please help me out to solve this...
Thanks in advance...