From [this stackoverflow question](https://stackoverflow.com/questions/37437805/convert-map-to-javascript-object)

Given in [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries), `fromEntries()` is available since Node v12:
```js
const map1 = new Map([
  ['foo', 'bar'],
  ['baz', 42]
]);

const obj = Object.fromEntries(map1);
// { foo: 'bar', baz: 42 }
```
For converting `Object` back to `Map`:
```js
const map2 = new Map(Object.entries(obj));
// Map(2) { 'foo' => 'bar', 'baz' => 42 }
```