A JS object which you can persist easily.
PersistableObject is available through npm
npm install persistable-object
PersistableObject provides you an object which can be persisted.
var persistableObject = require('persistable-object');
// load yourpo.json
var po = persistableObject("yourpo.json");
// use po as any other object.
po.hello = "world";
po.obj = {a:{b:1},c:{d:{e:5}}};
po.int = 5;
//persists the object to yourpo.json
po.save();