JAVASCRIPT

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);

convert json to map js, json to map

const jsonToMap = (json) => new Map(Object.entries(JSON.parse(json)));
const json = '{"user1":"John","user2":"Kate","user3":"Peter"}';
const map = jsonToMap(json);
// Kate
console.log(map.get('user2'));
// Map(3) { 'user1' => 'John', 'user2' => 'Kate', 'user3' => 'Peter' }
console.log(map);

Convertir Map a Json

String jsonString = new Gson().toJson(data, Map.class);