var i=0;
    var mainObj={};
    while(i<2){
        var obj={};
        obj.x ="data";
        obj.y= "data";
        mainObj.i=obj
        i=i+1;
    }
    console.log(JSON.stringify(mainObj));

output :- {"j":{"x":"data"."y":"data"}} {"j":{"x":"data"."y":"data"}}

Expected Output : {0:{"x":"data"."y":"data"},1:{"x":"data"."y":"data"}}

how to achieve this expected output i need the same output key should be number either in string format or number format