JAVASCRIPT

convert map to object/JSON javascript

const map1 = new Map([
  ['foo', 'bar'],
  ['baz', 42]
]);

const obj = Object.fromEntries(map1);
// { foo: 'bar', baz: 42 }

//To get back the map:
const map2 = new Map(Object.entries(obj));

convert map to json js, map to json

const mapToJson = (map) => JSON.stringify(Object.fromEntries(map));
const map = new Map([
  ['user1', 'John'],
  ['user2', 'Kate'],
  ['user3', 'Peter'],
]);
const json = mapToJson(map);
// {"user1":"John","user2":"Kate","user3":"Peter"}
console.log(json);