fs node js

make_folder.js

// https://nodejs.org/api/fs.html#fs_fs_mkdir_path_mode_callback
// fs.mkdir(path[, mode], callback) callback takes only err arg
var fs = require('fs');
fs.mkdir('test_dir', function(err) {
    if (err) {
        console.log(err)
    } else {
        console.log('looks fine')
    }
});

open_read_some_folder.js

// https://nodejs.org/api/fs.html#fs_fs_readdir_path_options_callback
var fs = require('fs');
fs.readdir(__dirname + '/files/img', function (err, files) {
    if (err) {
        console.log(err);
    } else {
        console.log(files);
    }
});