JSON.stringify with nested objects

test.js

var o1 = [{
    "name":"string",
    "active":"bool",
    "data":[{
        "value":"number",
        "date":"string"
    },{
        "value":"number2",
        "date":"string2",
        "children":[
            {"test":"123"},
            {"test":"456"}
        ]
    }]
}];
JSON.stringify(o1);
// output:
// '[{"name":"string","active":"bool","data":[{"value":"number","date":"string"},{"value":"number2","date":"string2","children":[{"test":"123"},{"test":"456"}]}]}]'