Variables in javascript are not enough to hold a value [closed]

I’m doing web scraping with javascript.

I’m wondering how I can store all the html code in a variable called websiteContent ?

Because according to my understanding javascript has only 3 types of variables var let and const , all of which are not enough to store at all.

What should I do?

This is my code:

function test() {
  var url = "https://pantip.com/topic/34943783"

  
  //fetch site content

  var websiteContent = UrlFetchApp.fetch(url);
  var fetchTime = Utilities.formatDate(new Date(), 'Etc/GMT', "yyyy-MM-dd HH:mm:ssZ"); // "yyyy-MM-dd'T'HH:mm:ss'Z'"

  //extract data

  var laDeathsRegExp = new RegExp(/(?<=title>)(.*)(?= - Pantip)/m);
 
  var laDeathsMatchText = laDeathsRegExp.exec(websiteContent);

  Logger.log(websiteContent.getContentText());

  Logger.log('' + laDeathsMatchText);
}