re-generate guid's in file

guid-update.js

var fs = require('fs');
var guid = /([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})/ig;

var inputFile = 'input.json';
var outputFile = 'result.json';

// читаем
fs.readFile(inputFile, 'utf8', function (err,data) {
  if (err) {
    return console.log(err);
  }
  // console.log(data);

  // преобразуем
  data = data.replace(guid, () => {
    function s4() {
      return Math.floor((1 + Math.random()) * 0x10000)
        .toString(16)
        .substring(1);
    }
    return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
      s4() + '-' + s4() + s4() + s4();
  });

  // пищем
  fs.writeFile(outputFile, data, 'utf8', function(err) {
    if(err) {
      return console.log(err);
    }

    console.log("The file was saved!");
  });

});