html_to_pdf

Generate a simple PDF invoice from HTML using puppeteer & handlebars

Introduce

• Puppeteer

  Puppeteer is Node.js library giving you access to a headless Chrome browser. This makes it a breeze to generate PDF files with Node.js

• Handlebars

  Handlebars provides the power necessary to let you build semantic templates effectively with no frustration

How to use

• Run npm install to install package in package.json
• Run node example.js to generate invoice.pdf

The PDF Invoice from HTML

1. Prepare content html (invoice.html)
2. Using handlebars to binding data to content html
3. Using Puppeteer to generate pdf from final html

index.js

const puppeteer = require("puppeteer");
const handlebars = require("handlebars");

module.exports.html_to_pdf = async ({ templateHtml, dataBinding, options }) => {
  const template = handlebars.compile(templateHtml);
  const finalHtml = encodeURIComponent(template(dataBinding));

  const browser = await puppeteer.launch({
    args: ["--no-sandbox"],
    headless: true,
  });
  const page = await browser.newPage();
  await page.goto(`data:text/html;charset=UTF-8,${finalHtml}`, {
    waitUntil: "networkidle0",
  });
  await page.pdf(options);
  await browser.close();
};

example.js

const fs = require("fs");
const path = require("path");
const { html_to_pdf } = require(".");

try {
  (async () => {
    const dataBinding = {
      items: [
        {
          name: "item 1",
          price: 100,
        },
        {
          name: "item 2",
          price: 200,
        },
        {
          name: "item 3",
          price: 300,
        },
      ],
      total: 600,
      isWatermark: true,
    };

    const templateHtml = fs.readFileSync(
      path.join(process.cwd(), "invoice.html"),
      "utf8"
    );

    const options = {
      format: "A4",
      headerTemplate: "<p></p>",
      footerTemplate: "<p></p>",
      displayHeaderFooter: false,
      margin: {
        top: "40px",
        bottom: "100px",
      },
      printBackground: true,
      path: "invoice.pdf",
    };

    await html_to_pdf({ templateHtml, dataBinding, options });

    console.log("Done: invoice.pdf is created!");
  })();
} catch (err) {
  console.log("ERROR:", err);
}

How to display paid stamp watermark on invoice?

Using handlebars to check param isWatermark

  {{#if isWatermark}}
    <div style="border-width: 6px;border-style: solid; border-color: #008000;border-radius: 8px; color: #008000; opacity:0.6; position: absolute; z-index: 1; left:40%; top:30%; font-size: 60pt;-webkit-transform: rotate(-45deg);-ms-transform: rotate(-45deg);transform: rotate(-45deg); font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif;">
        PAID </div>
    {{/if}}

Change isWatermark: true and run node pdf.js again

License

html_to_pdf is available under the MIT license. See the LICENSE file for more info.