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const fs = require('fs');

fs.readdir(testFolder, (err, files) => {
  files.forEach(file => {
    console.log(file);
  });
})

fs.readFile('./config.json', 'utf8', function (err,data) {
  if (err) {
    return console.log(err);
  }
  console.log(data.toString('utf8'));
});