JSFiddle - React, Tailwind, and code Playground

JavaScript

var obj = {"2012" : {}, "2011" : {}, "2013" : {}};
var arr = [];
for (var year in obj) {
    arr.push({year : year, data : obj[year]});
}
arr.sort(function(a,b) {
    return b.year - a.year;
});
console.log(arr);