JSFiddle - React, Tailwind, and code Playground

JavaScript

function Obj() {
    this.label = "new object";
}

Obj.prototype.setLabel = function(newLabel) {
    this.label = newLabel;
};

var data = '{"label": "new object"}';
var inst = new Obj;
$.extend(inst, JSON.parse(data));

console.log(inst);