Simple JS Proxy

simple_proxy.js

// a handler object specifies which methods to proxy
// this one will simply override JavaScript’s default object get method
const loggingHandler = {
  get(target, property) {
    const val = target[property]
    console.log(`Property "${property}" returned "${JSON.stringify(val)}"!`)
    return val
  }
}

const data = { foo: 'bar' }

const loggedObject = new Proxy(data, loggingHandler)

// now, let's access a property to test that it works
const foo = loggedObject.foo

// Logged to the console:  Property "foo" returns "bar"