Local shortcut for HTTP request done before

my-fetch.js

const fs = require('fs');
const util = require('util');
const crypto = require('crypto');
const mkdrip = require('mkdirp');
const fetch = require('node-fetch');

const exists = util.promisify(fs.exists);
const readFile = util.promisify(fs.readFile);

module.exports = url => {
  const hash = crypto
    .createHash('md5')
    .update(url)
    .digest('hex');

  const fileName = `c:/temp/data/${hash}.json`;

  return exists(fileName).then(async exists => {
    if (exists) {
      const data = JSON.parse(await readFile(fileName, 'utf8'));
      return data;
    } else {
      const rsp = await fetch(url);
      const data = await rsp.json();

      mkdrip('c:/temp/data', err => {
        if (err) throw err;
        fs.writeFile(fileName, JSON.stringify(data, null, 2), err => {
          if (err) console.error(err);
        });
      });
      
      return data;
    }
  });
};