const apiResponse = (payload = {}) => {

    const DataSymbol = Symbol('data');
    const StatusSymbol = Symbol('status');
    const ErrorsSymbol = Symbol('errors');
    const MessageSymbol = Symbol('message');

    class ApiResponse {
        constructor({ data = {}, status = 1, errors = [], message = '' }) {
            this.data = data;
            this.status = status;
            this.errors = errors;
            this.message = message;
        }

        get data() {
          return this[DataSymbol];
        }

        set data(data) {
          if (typeof data === 'undefined')
              throw new Error('Data must be defined');
          this[DataSymbol] = data;
        }

        get status() {
          return this[StatusSymbol];
        }

        set status(status) {
          if (isNaN(status) || (status !== 0 && status !== 1))
            throw new Error('Status must be a number, 1 is OK, 0 is BAD');
          this[StatusSymbol] = status;
        }

        get errors() {
          return this[ErrorsSymbol];
        }

        set errors(errors) {
          if (!Array.isArray(errors))
            throw new Error('Errors must be an array');
          this[ErrorsSymbol] = errors;
        }

        get message() {
          return this[MessageSymbol];
        }

        set message(message) {
          if (typeof message !== 'string')
            throw new Error('Message must be a string');
          this[MessageSymbol] = message;
        }

        toJSON() {
            return {
                data: this.data,
                status: this.status,
                errors: this.errors.map(e => e.stack ? e.stack : e),
                message: this.message,
            }
        }
    }

    return new ApiResponse(payload);

}

//Usage
const todos = [{ ... }, { ... }]; // an array of todos

router.get('/todos', function(req, res, next){
    res.status(200);
    res.json(apiResponse({
        data: todos,
        message: 'You have a lot todo!',
    }));
});