JSFiddle - React, Tailwind, and code Playground

JavaScript

var something = {
            "friends_count": {
                "1420800660": 49391,
                "1421149814": 49344,
                "1421149955": 49344
            }
    },
    dateCheck,
    newest;

for(var key in something.friends_count){
    if(!dateCheck || new Date(key*1000) > dateCheck){
        dateCheck = new Date(key*1000);
        newest = something.friends_count[key];
    }
}
console.log(newest);