Question

Have I any chance to serialize meta (any format, so I can store it in DB)?

var obj1 = {};
var obj2 = {};
obj1.link = obj2;
obj2.link = obj1;
var meta = [obj1, obj2];

As I understand the problem is that JSON serialize object`s links to objects.

Answer 1

Yes. You’ll need to give your objects some kind of ID and use that as a reference.

var obj1 = {id: "obj1"};
var obj2 = {id: "obj2"};
obj1.link = "obj2";
obj2.link = "obj1";
var meta = [obj1, obj2];