updateReadme.js

const fs = require('fs');
const IMAGES = JSON.parse(fs.readFileSync('images.json'));

fs.readFile('README.md', function read(err, data) {
  if (err) {
    throw err;
  }
  const file_content = data.toString();
  var str = `Name | Len folder | Example \n --- | :---: | :---:  \n`;
  Object.keys(IMAGES).forEach(key => {
    if (key.match('#')) {
      fs.renameSync(
        `./Images/${key}`,
        `./Images/${key.replaceAll('#', 'Hashtag')}`,
        function(err) {
          if (err) throw err;
        }
      );
      key = key.replaceAll('#', 'Hashtag');
    }
    let folder = IMAGES[key];
    if(!folder) console.log(key)
    str +=
      '| `' +
      key +
      '`|' +
      `${folder.length}| <img src="./Images/${key}/${
        folder[Math.floor(folder.length * Math.random())]
      }"  width="160"> \n`;
  });

  const idx =
    file_content.indexOf('## Current Folders') + '## Current Folders'.length;
  const result =
    file_content.slice(0, idx) + '\n' + str ;
  fs.writeFile(__dirname + '/README.md', result, err => {
    if (err) throw err;
    else console.log('Update readme');
  });
});