export function isJsonString(str: string | null): boolean {
  if (typeof str === 'string') {
    try {
      let obj = JSON.parse(str) as string | {[key: string]: unknown};
      if (typeof obj === 'string') {
        obj = JSON.parse(obj) as {[key: string]: unknown};
      }

      if (typeof obj === 'object' && obj) {
        return true;
      }
      return false;
    } catch (e) {
      return false;
    }
  }
  return false;
}

export function jsonString2jsonObject<T>(jsonString: string | null): T | null {
  if (!isJsonString(jsonString)) {
    return null;
  }

  let obj = JSON.parse(jsonString as string) as string | T;

  if (typeof obj === 'string') {
    obj = JSON.parse(obj) as T;
  }

  return obj;
}