jsonArrayForGoogleSlides.js

function listDocsInFolder() {
  var folderId = '########'  // folder id that can be retrived from the url of the Google Drive folder
  var folder = DriveApp.getFolderById(folderId);
  var files = folder.getFiles();
  var fileDetails = []
  while (files.hasNext()){
    file = files.next();
    fileDetails.push({id:file.getId(), name: file.getName()})
  }
  var jsonFiles = JSON.stringify(fileDetails, null, 2)

  Logger.log('File details:\n %s', jsonFiles);
}