JSFiddle - React, Tailwind, and code Playground

JavaScript

var json = [{"Foo":[{"id":1,"name":"aaa"},{"id":2,"name":"bbb"}]},{"Bar":[{"id":3,"name":"ccc"},{"id":4,"name":"ddd"}]}];

$.each(json, function(i,group) {
    console.log(i);
    $.each(group, function(j, option) {
        console.log(j, option);
        $.each(option, function(k, item) {
            console.log(k, item);
        });
    });
});