function list_all_files_inside_one_folder_without_subfolders(){
var sh = SpreadsheetApp.getActiveSheet();
var folder = DriveApp.getFolderById('1mx-C16lEB22Y-ZHx1-BurfGWa6jKSnOi'); // change the folder ID here
var list = [];
sh.getRangeList(['A1:Z999']).clearContent()
list.push(['Name','Type','Size','Url']);
var files = folder.getFiles();
while (files.hasNext()){
file = files.next();
var row = []
row.push(file.getName(),file.getMimeType(),file.getSize(), file.getUrl())
list.push(row);
}
sh.getRange(1,1,list.length,list[0].length).setValues(list);
}
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}