Recursively create directories with Node.js

Recently, while working on a new project, I needed to create a series of nested
directories. From the command-line, it’s easy enough, just pass -p to mkdir
and it will create all of the parent directories automatically.

With modern versions of Node.js, specifically 10 and above, you can achieve the same functionality with fs:

Synchronously

fs.mkdirSync('./path/to/my/directory', { recursive: true });

Asynchronously

await fs.promises
  .mkdir('./path/to/my/directory', { recursive: true });

Assuming you’re on an older version of Node.js and are reluctant to upgrade to
10+, you’ll have to do things a bit more manually.

The gist is, you’ll need to break the path apart and loop through each part of it, creating the non-existent parent directories along the way. That looks something like this:

const path = './path/to/my/directory';

path.split('/').reduce(
  (directories, directory) => {
    directories += `${directory}/`;

    if (!fs.existsSync(directories)) {
      fs.mkdirSync(directories);
    }

    return directories;
  },
  '',
);

With 10.x currently in maintenance mode and at end of life very soon, I’d highly
recommend upgrading Node.js before doing the aforementioned.