JSFiddle - React, Tailwind, and code Playground

JavaScript

var obj = {
1:
{"id":1,"rawId":null,"displayName":"Person C","name":null,"nickname":null,"phoneNumbers":[{"type":"mobile","value":"phonenumb53534r","id":0,"pref":false}],"emails":null,"addresses":null,"ims":null,"organizations":null,"birthday":null,"note":null,"photos":null,"categories":null,"urls":null},
2:
{"id":2,"rawId":null,"displayName":"Person B","name":null,"nickname":null,"phoneNumbers":[{"type":"mobile","value":"phonenumber535345","id":0,"pref":false}],"emails":null,"addresses":null,"ims":null,"organizations":null,"birthday":null,"note":null,"photos":null,"categories":null,"urls":null},
3:
{"id":3,"rawId":null,"displayName":"Person A","name":null,"nickname":null,"phoneNumbers":[{"type":"mobile","value":"phonenumber47474","id":0,"pref":false}],"emails":null,"addresses":null,"ims":null,"organizations":null,"birthday":null,"note":null,"photos":null,"categories":null,"urls":null}
};

arrayOfObj = [];

for (item in obj) {
    if (obj.hasOwnProperty(item)) {
        arrayOfObj.push(obj[item]);
    }
}

arrayOfObj.sort(function (a, b) {
    if (a.displayName < b.displayName) {
        return -1;
    }
    else if (a.displayName > b.displayName) {
        return 1;
    }
    return 0;
}).forEach(function (elem) { console.log(elem.displayName); });