JSFiddle - React, Tailwind, and code Playground

JavaScript

var jsonString = '[    {        "ID": "23",        "LastName": "Moe",        "FirstName": "Ronnie",        "Orders": [            {                "OrderNumber": "11",                "ItemNumber": "22"            },            {                "OrderNumber": "33",                "ItemNumber": "44"            }        ]    }]';

var json = JSON.parse(jsonString);

$.each(json, function (index, value) {
    $.each(value.Orders, function (index, value) {
        //console.log(value);
        alert(value);
    });
});