Object properties can contain any kind of value. That includes other objects!

This allows us to organize our data better:

const book = {
  title: 'Gone with the Wind',
  genre: 'Epic Historical Romance',
  author: {
    name: 'Margaret Mitchell',
    nationality: 'American',
  },
};

Creating Nested Objects

We can create nested objects all at once like the example above.

We could also create individual objects and then merge them together:

const margaretMitchell = {
  name: 'Margaret Mitchell',
  nationality: 'American',
};
const book = {
  title: 'Gone with the Wind',
  genre: 'Epic Historical Romance',
  author: margaretMitchell,
};

Both examples will create an identical object.

Accessing Nested Object Properties

To access the properties inside nested objects, we chain property names together:

const book = {
  title: 'Gone with the Wind',
  genre: 'Epic Historical Romance',
  author: {
    name: 'Margaret Mitchell',
    nationality: 'American',
  },
};
console.log(book.title); // "Gone with the Wind"
console.log(book.author.name); // "Margaret Mitchell"