javascript (pure) logic for localStorage of browser

SimpleStorage.js

window.SimpleStorage = (function () {
	const storageName = 'tmpName';
	return{
		get: function (id) {
			var storage = localStorage.getItem(storageName);
			if(storage)try {
				storage = JSON.parse(storage);
				return typeof storage[id] !== 'undefined' ? storage[id] : null;
			} catch (e) {
				return null;
			}
			return null;
		},
		getAll: function () {
			var storage = localStorage.getItem(storageName);
			if(storage)try {
				storage = JSON.parse(storage);
				return storage;
			} catch (e) {
				return null;
			}
			return null;
		},
		set: function (id, data) {
			var storage = ConstructorStorage.check();
			storage[id] = data;
			localStorage.setItem(storageName, JSON.stringify(storage));
		},
		remove: function (id) {
			var storage = ConstructorStorage.check();
			delete storage[id];
			localStorage.setItem(storageName, JSON.stringify(storage));
		},
		removeAll: function () {
			localStorage.removeItem(storageName);
		},
		check: function () {
			var storage = localStorage.getItem(storageName);
			if(storage)try {
				storage = JSON.parse(storage);
				return $.isEmptyObject(storage) ? ConstructorStorage.create() : storage;
			} catch (e) {
				return ConstructorStorage.create();
			} else
				return ConstructorStorage.create();
		},
		create: function () {
			var storage = {};
			localStorage.setItem(storageName, JSON.stringify(storage));
			return storage;
		}
	}
})();
SimpleStorage.check();