JSFiddle - React, Tailwind, and code Playground

JavaScript

Storage.prototype.setObject = function(key, value) {
    this.setItem(key, JSON.stringify(value));
}

Storage.prototype.getObject = function(key) {
    var value = this.getItem(key);
    return value && JSON.parse(value);
}

$(function() {
    localStorage.setObject('x', {1: 2,5, 2: "s"})
    console.log(localStorage.getObject('x'));
});