createDir.js

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

fs.writeFile('content.txt', 'This is my first file!', (err) => {
  if (err) {
      throw err;
  };

  process.stdout.write('File created successfully!');
});

const filePath = path.join(process.cwd(), 'content.txt');

fs.readFile(filePath, (error, content) => {
  if (error) throw error;

  process.stdout.write(content);
});

fs.readdir(process.cwd(), (error, files) => {
  if (error) throw error;

  console.log(files);
});

fs.mkdir(`${process.cwd()}/myFolder/secondFolder`, { recursive: true }, (err) => {
  if (err) throw err;

  console.log('Folder created successfully!');
});