Use object to build directory structure.

write-directories.js

const fs = require('fs');

// Paths functions from
// https://lowrey.me/getting-all-paths-of-an-javascript-object/
function getPaths(root) {
    let paths = [];

    let nodes = [{
        obj: root,
        path: []
    }];

    while (nodes.length > 0) {
        let n = nodes.pop();

        Object.keys(n.obj).forEach(k => {
            if (typeof n.obj[k] === 'object') {
                let path = n.path.concat(k);

                paths.push(path);

                nodes.unshift({
                    obj: n.obj[k],
                    path: path
                });
            }
        });
    }

    return paths;
}

const rootFolder = process.argv[2] || 'your-project-name';

const directoryStructure = {
    [rootFolder]: {
        first: {
            second: {},
            third: {
                fourth: {}
            }
        }
    }
};

const allPaths = getPaths(directoryStructure);

allPaths.forEach(path => {
    const pathName = path.join('/');
    fs.mkdirSync(pathName);
});

So i may have had a little too much fun...

const fs = require('fs-extra');

const awesomeDirectoryStruct = {
  RootDirectory: {
    'Level-1-Directory': {
      'Level-2A-Directory': 'Level-3-And-Final-Directory',
      'Level-2B-Directory': {
        'Level-3A-Directory': 'Level-4-And-Final-Directory',
        'Level-3B-Directory': 'Level-4-And-Final-Directory'
      },
      'Level-2C-Directory': {
        'Level-3-Directory': {
          'Level-4-Directory': 'Level-5-And-Final-Directory'
        }
      }
    }
  }
}

async function createAwesomeDirectoryStruct(obj) {
  const directoriesToCreate = function andThen(bit, path = '') {
    return [].concat(
      ...Object.keys(bit).map(key => {
      	const value = bit[key];
      	const tmpPath = `${path}/${key}`;
        return typeof value === 'object'
          ? andThen(value, tmpPath)
          : `${tmpPath}/${value}`;
      }))
  }(obj).map(path => {  // this maps the array of paths to an array of promises promises since `fs.mkdirp` is async. (fs.mkdirpSync exists)
    return new Promise((resolve, reject) => {
      return fs.mkdirp(`${__dirname}${path}`, (error, result) => {
        if (error) return reject(error);

        return resolve(result)
      })
    });
  });

  return await Promise.all(directoriesToCreate);  // this '.all' executes an array of promises in parallel and returns when all finish resolving
}

createAwesomeDirectoryStruct(awesomeDirectoryStruct)

😈