htmlpdf.js -- Convert HTML to PDF using Google Chrome/Chromium

htmlpdf.js

#!/usr/bin/env node

// htmlpdf.js -- Convert HTML to PDF using Google Chrome/Chromium
// Usage:
//   node htmlpdf.js input.html output.pdf
//   node htmlpdf.js https://google.com output.pdf
//
// Using Chrome/Chromium via puppeteer provides support for modern web
// technologies (CSS grid, etc.) and pixel-perfect rendering.
// Thus, this script correctly transforms websites where PhantomJS or wkhtmltopdf fail.
//
// We use CSS paper layout and margins by default, this can be changed in `options` below.
// Cf. https://github.com/puppeteer/puppeteer/blob/main/docs/api.md#pagepdfoptions
//
// Published by Christian Aichinger (https://greek0.net/) on
// https://gist.github.com/ChrisAichinger/151050a7c16070cdbd84e2697f7332d1
// Based on https://www.npmjs.com/package/pdf-puppeteer, thus licensed under 3-clause BSD.

const fs = require('fs');
const puppeteer = require('puppeteer');
const process = require('process');


const convertHTMLToPDF = async (url, output, options=null, puppeteerArgs=null) => {
    let browser;
    if (puppeteerArgs) {
        browser = await puppeteer.launch(puppeteerArgs);
    } else {
        browser = await puppeteer.launch();
    }

    const page = await browser.newPage();
    await page.goto(url, {waitUntil: 'networkidle0'});
    const result = await page.pdf(options);
    await browser.close();
    return result;
};


let input = process.argv[2];
if (!input.includes('://')) {
    input = 'file:///' + fs.realpathSync(input);  // file:// urls must be absolute.
}
const output = process.argv[3];
const options = {
    format: 'A4',
    path: output,
    preferCSSPageSize: true,
};
convertHTMLToPDF(input, output, options).catch(error => console.log(error));