The techniques in this article show how to use Puppeteer’s APIs to add server-side rendering (SSR) capabilities to an Express web server. The best part is the app itself requires almost no code changes. Headless does all the heavy lifting. In a couple of lines of code you can SSR any page and get its final markup.

A taste of what’s to come:

import puppeteer from 'puppeteer';

async function ssr(url) {
  const browser = await puppeteer.launch({headless: true});
  const page = await browser.newPage();
  await page.goto(url, {waitUntil: 'networkidle0'});
  const html = await page.content(); // serialized HTML of page DOM.
  await browser.close();
  return html;

Source: Headless Chrome: an answer to server-side rendering JS sites - Tools for Web Developers - Google Developers

Interesting, but I wonder how it’ll work if the receiving browser doesn’t quite match up with what Headless Chrome generates.