How does JSON.parse(JSON.stringify(obj)) deep clone an object?

JSON.stringify turns a JavaScript object into JSON text and stores that JSON text in a string, eg:

var my_object = { key_1: "some text", key_2: true, key_3: 5, key_6: [{}] };

var object_as_string = JSON.stringify(my_object);  
// "{"key_1":"some text","key_2":true,"key_3":5,"key_6":[{}]}"

typeof(object_as_string);  
// "string"  

So here, all the objects and array has lost it's reference.

And when we do JSON.parse turns a string of JSON text into a JavaScript object, eg:

var object_as_string_as_object = JSON.parse(object_as_string);  
// {key_1: "some text", key_2: true, key_3: 5, key_6: Array(1)}

typeof(object_as_string_as_object);  
// "object" 

Now the resulting objects got the new storage reference. Let's test it by checking the reference of array inside the parent object an example.

my_object.key_6 === my_object.key_6
// true  

But, if we try

 my_object.key_6 === object_as_string_as_object.key_6
// false