Count the number of files in a directory using JavaScript/nodejs?

Question

How can I count the number of files in a directory using nodejs with just plain JavaScript or packages? I want to do something like this:

How to count the n

Answer 1

Alternative solution without external module, maybe not the most efficient code, but will do the trick without external dependency:

var fs = require('fs');

function sortDirectory(path, files, callback, i, dir) {
    if (!i) {i = 0;}                                            //Init
    if (!dir) {dir = [];}
    if(i < files.length) {                                      //For all files
        fs.lstat(path + '\\' + files[i], function (err, stat) { //Get stats of the file
            if(err) {
                console.log(err);
            }
            if(stat.isDirectory()) {                            //Check if directory
                dir.push(files[i]);                             //If so, ad it to the list
            }
            sortDirectory(callback, i + 1, dir);                //Iterate
        });
    } else {
        callback(dir);                                          //Once all files have been tested, return
    }
}

function listDirectory(path, callback) {
    fs.readdir(path, function (err, files) {                    //List all files in the target directory
        if(err) {
            callback(err);                                      //Abort if error
        } else {
            sortDirectory(path, files, function (dir) {         //Get only directory
                callback(dir);
            });
        }
    })
}

listDirectory('C:\\My\\Test\\Directory', function (dir) {
    console.log('There is ' + dir.length + ' directories: ' + dir);
});