Wrap your JS objects in a Proxy so that you can safely access their properties (ES2015+)

safeObjectProxy.js

const proxyObj = (obj) {
  return new Proxy(obj, {
    get: function(target, name) {
      const result = target[name];
      if (!!result) {
        return (result instanceof Object)? proxyObj(result) : result;
      }
      return proxyObj({});
    }
  });
};

// Usage:
const jane = {
  name: 'Jane',
  age: 35
};
const john = {
  name: 'John',
  address: {
    street: '7th Avenue',
    city: 'Ecmaville',
    zipCode: '23233'
  },
  sister: jane,
  age: 28
};
var proxyPerson = proxyObj(john);                    
console.log(proxyPerson.name);                  // --> "John"
console.log(proxyPerson.address.street);        // --> "7th Avenue"
console.log(proxyPerson.sister.name);           // --> "Jane"
console.log(proxyPerson.sister.address);        // --> {}
console.log(proxyPerson.sister.address.street); // --> {}

// See also: 
// https://gist.github.com/dakaraphi/6a87168db66fd8f032d2