Unable store the objects into an array in javascript

I'm trying to store the objects into Javascript array.

var res=[
    {name:'Alex',place:'US',age:20},
    {name:'Jason',place:'Canada',age:25}

  ];

var obj={};
var data=[];

for ( let i in res){
    obj.name=res[i].name;
    obj.place=res[i].place;
    data.push(obj);
 }


console.log(data);

My expected output:

[ 
  {name:'Alex',place:'US'}.
  {name:'Jason',place:'Canada'} 
]

Actual output I got:

[ 
  {name:'Jason',place:'Canada'},
  {name:'Jason',place:'Canada' }
]

Why I'm getting this type of output?
I'm noobie.Please help me.