var de=new Array(); function myFunction() { var folder = DriveApp.getFolderById("0B9c7WttLh-m7emNnSllLbEVuRmc"); var con = folder.getFiles(); sx=0; while(con.hasNext()) { file = con.next(); sx=sx+1; de[sx] = file.getId(); } var doc = DocumentApp.openById(de[1]); var text = doc.getText(); Logger.log(text); }