A quick way to create a new directory and every necessary subdirectory. For a better tested solution, use 'mkdirp' package.

mkdirp.js

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

const fsMkdir = util.promisify(fs.mkdir)
const fsExists = util.promisify(fs.exists)

/**
 *
 * @param {string} dirpath
 */
const mkdirp = function(dirpath) {
    const segments = path.posix.resolve(dirpath).split('/')
    let promise = Promise.resolve()

    for (let end=2; end<=segments.length; end++) {
        const tmpDirpath = segments.slice(0, end).join('/')

        // chain promises
        promise = promise
            .then(() => fsExists(tmpDirpath))
            .then((exists) => exists ? 1: fsMkdir(tmpDirpath))
    }

    return promise
}