html2pdf with Puppeteer

pdf.js

'use strict';

const puppeteer = require('puppeteer');
const fs = require('fs'); //Filesystem

let content = fs.readFileSync(process.argv[2], "utf-8");

const createPdf = async() => {
  let browser;
  try {
    browser = await puppeteer.launch({args: [
      '--no-sandbox',
      '--disable-setuid-sandbox'
    ]});

    const page = await browser.newPage();
    await page.setContent(content, {waitUntil: 'networkidle0'});
    await page.setViewport({
      width: 1024,
      height: 768
    })
    await page.waitFor(250);
    await page.pdf({
      path: process.argv[3],
      format: 'A4',
      margin: { top: 36, right: 36, bottom: 20, left: 36 },
      printBackground: true
    });
  } catch (err) {
      console.log(err.message);
  } finally {
    if (browser) {
      browser.close();
    }
    process.exit();
  }
};

createPdf();

If you're deploying to heroku, you'll need the node and puppeteer buildpacks as mentioned in this post: https://www.forsbergplustwo.com/blogs/news/pdf-generation-with-chrome-headless-in-ruby-using-puppeteer-on-heroku