main.dart

import 'dart:convert';

void main() {
  try {
  var resBody = {};
  resBody["email"] = "[email protected]";
  resBody["password"] = "admin123";
  var user = {};
  user["user"] = resBody;
  String str = JSON.encode(user);
  print(str);
  } catch(e) {
    print(e);
  }
}