get-html-from-dynamic-website.js

const puppeteer = require("puppeteer");

async function request(url, cookie, headers = {}, cb) {
  try {
    const browser = await puppeteer.launch({ args: ["--start-fullscreen"] });
    
    const page = await browser.newPage();
    
    if (cookie) {
      await page.setCookie(cookie);
    }
    
    await page.setViewport({ width: 1366, height: 768 });
    
    await page.setExtraHTTPHeaders({
      "user-agent":
        "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36",
      ...headers
    });

    await page.goto(url, {
      waitUntil: "networkidle0",
    });
    
    // if you need screenshot when site loaded
    await page.screenshot({ path: "example.png" });
    
    const html = await page.evaluate(
      () => document.documentElement.outerHTML
    );
    
    await browser.close();
    
    cb && cb(null, html);
  } catch (err) {
    console.error(err);
    cb && cb(error);
  }
}

request("any url", cookie, (error, html) => {
  console.log(html);
});