function doGet() {
  const sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  const data = sheet.getDataRange().getValues();
  const headers = data[0];
  const rows = data.slice(1);

  const json = rows.map(row => {
    let obj = {};
    headers.forEach((header, i) => {
      let value = row[i];
      // 날짜 데이터 처리
      if (value instanceof Date) {
        value = Utilities.formatDate(value, "GMT+9", "yyyy. MM. dd. HH:mm");
      }
      obj[header] = value;
    });
    return obj;
  });

  return ContentService.createTextOutput(JSON.stringify(json))
    .setMimeType(ContentService.MimeType.JSON);
}