Get all directories recursive within directory with nodejs

Question

I want to get all directories synchronize within a given directory.

<MyFolder>
    |- Folder1
       |- Folder11
       |- Folder12
    |- Folder2
    |- File1.txt
    |- File2.txt
    |- Folder3
        |- Folder31
        |- Folder32

I would expect to get an array of:

["Folder1/Folder11", "Folder1/Folder12", "Folder2", "Folder3/Folder31", "Folder3/Folder32"]

This is my code:

const fs = require('fs');
const path = require('path');

function flatten(lists) {
  return lists.reduce((a, b) => a.concat(b), []);
}

function getDirectories(srcpath) {
  return fs.readdirSync(srcpath)
  .map(file => path.join(srcpath, file))
  .filter(path => fs.statSync(path).isDirectory());
}

function getDirectoriesRecursive(srcpath) {
  return [srcpath, ...flatten(getDirectories(srcpath).map(getDirectoriesRecursive))];
}

Would anyone help me solve the problem above?

You need to format the elements in the returned array , iterate it and do the formatting on the elements and create new array from the formatted elements to achieve your results — saravana
– saravana, Commented Oct 2, 2019 at 7:10
The function getDirectoriesRecursive() seems to work reasonably well .. maybe you could detail exactly what's going wrong for you? When I run your code I get the output: [ '.\\', 'Folder1', 'Folder1\\Folder11', 'Folder1\\Folder12', 'Folder2', 'Folder3', 'Folder3\\Folder31', 'Folder3\\Folder32' ] — Terry Lennox
– Terry Lennox, Commented Oct 2, 2019 at 7:41

Mulan · Accepted Answer · 2021-05-03 18:31:29Z

async

Here's a highly optimised version using Node's fast fs.Dirent objects. This approach allows you to skip the expensive fs.existsSync and fs.statSync calls on every path -

const { readdir } =
  require ("fs/promises")

const { join } =
  require ("path")

const dirs = async (path = ".") =>
  Promise.all
    ( (await readdir (path, { withFileTypes: true }))
        .map
          ( dirent =>
              dirent .isDirectory ()
                ? dirs (join (path, dirent.name))
                : []
          )
    )
    .then
      ( results =>
          [] .concat (path, ...results)
      )

You use it like this -

dirs ("MyFolder") .then (console.log, console.error)

sync

We can rewrite the above function using synchronous functions instead -

const { readdirSync } =
  require ("fs")

const { join } =
  require ("path")

const dirsSync = (path = ".") =>
  [].concat
    ( path
    , ...readdirSync (path, { withFileTypes: true })
        .map
          ( dirent =>
              dirent .isDirectory ()
                ? dirsSync (join (path, dirent.name))
                : []
          )
    )

You use it like this -

console .log (dirsSync ("MyFolder"))

This can be further simplified by using Array.prototype.flatMap -

const { readdirSync } =
  require ("fs")

const { join } =
  require ("path")

const dirsSync = (path = ".") =>
  [ path
  , ...readdirSync (path, { withFileTypes: true })
      .flatMap
        ( dirent =>
            dirent .isDirectory ()
              ? dirsSync (join (path, dirent.name))
              : []
        )
  ]

cнŝdk · Accepted Answer · 2019-10-02 15:03:17Z

0

You were almost there, you just need to avoid files (not directories), so the getDirectoriesRecursive(srcpath) function recursion won't throw an error.

This is how should be the final getDirectoriesRecursive code:

function getDirectoriesRecursive(srcpath) {
  return [srcpath, ...flatten(getDirectories(srcpath).map((p) => {
    try {
      if (fs.existsSync(path)) {
        if (fs.lstatSync(path).isDirectory()) {
          return getDirectoriesRecursive(path);
        }
      }
    } catch (err) {
      console.error(err)
    }
  }).filter(p => p !== undefined))];
}

This is a live working Repl Demo to show all directories inside "/opt".

edited Oct 2, 2019 at 15:03

answered Oct 2, 2019 at 14:50

cнŝdk

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