JSFiddle - React, Tailwind, and code Playground

JavaScript

var items = [
    {Id: "01", Name: "A", Price: "1.00", Quantity: "1",TimeStamp:111},
    {Id: "02", Name: "B", Price: "10.00", Quantity: "1",TimeStamp:222},
    {Id: "04", Name: "C", Price: "9.50", Quantity: "10",TimeStamp:434},
    {Id: "03", Name: "a", Price: "9.00", Quantity: "2",TimeStamp:545},
    {Id: "06", Name: "b", Price: "100.00", Quantity: "2",TimeStamp:676},
    {Id: "05",Name: "c", Price: "1.20", Quantity: "2",TimeStamp:777}
];

items.forEach(function (d, index) {
    d.Index = index + 1;
});

console.log(items);