如何将对象转为JSON字符串？

/**
 * 对象转字符串
 * @param data
 * @returns 字符串
 */
static beanToJsonStr(data: Object | Array<Object | String | Number | Boolean> | null | undefined): string {
  try {
    if (data == null || data == undefined) {
      return ''
    }
    return JSON.stringify(instanceToPlain(data))
  } catch (err) {
    let error = err as BusinessError;
    LogUtil.error(`JSONUtil-beanToJsonStr-异常 ~ code: ${error.code} -·- message: ${error.message}`);
    return ""
  }
}