Javascript Pdf Course May 2026

PDF basics

Tooling and libraries

Creating PDFs from scratch

Converting HTML to PDF

Editing and merging PDFs

Advanced features

Testing and deployment

Project: Invoice generator

Resources

Filling a PDF form using pdf-lib (Universal JavaScript):

import  PDFDocument  from 'pdf-lib';
import fs from 'fs';
async function fillTaxForm() 
// 1. Load the existing PDF template
const templateBytes = fs.readFileSync('w9_template.pdf');
const pdfDoc = await PDFDocument.load(templateBytes);
// 2. Get the form
const form = pdfDoc.getForm();
// 3. Fill fields
form.getTextField('Name').setText('Jane Developer');
form.getTextField('SSN').setText('123-45-6789');
form.getCheckBox('IsUSCitizen').check();
// 4. Flatten to prevent editing
form.flatten();
// 5. Save
const pdfBytes = await pdfDoc.save();
fs.writeFileSync('filled_w9.pdf', pdfBytes);

Before installing heavy libraries, remember that the browser is a rendering engine. You can use window.print() to turn any webpage into a PDF.

The Trick: Create a "print-only" stylesheet.

@media print 
  body 
    margin: 0;
    padding: 0;
.no-print 
    display: none; /* Hide buttons, nav bars */
.print-header 
    position: fixed;
    top: 0;
a[href]::after 
    content: " (" attr(href) ") "; /* Show URLs */

JavaScript:

document.getElementById('generatePrint').onclick = () => 
  window.print();
;

Best for: Receipts, simple reports, and legal documents where WYSIWYG matters.

If you are building a React/SaaS app, here is the industry standard pattern for PDF generation:

import  useRef  from 'react';
import  useReactToPrint  from 'react-to-print';
import jsPDF from 'jspdf';
import html2canvas from 'html2canvas';
const InvoiceGenerator = () => 
const componentRef = useRef(); javascript pdf course
// Option A: Print stylesheet method (Fastest)
const handlePrint = useReactToPrint(
content: () => componentRef.current,
);
// Option B: Exact pixel download (Best for saving files)
const handleDownload = async () => 
const canvas = await html2canvas(componentRef.current,  scale: 2 );
const imgData = canvas.toDataURL('image/png');
const pdf = new jsPDF(
orientation: 'portrait',
unit: 'px',
format: [canvas.width, canvas.height]
);
pdf.addImage(imgData, 'PNG', 0, 0, canvas.width, canvas.height);
pdf.save('invoice.pdf');
;
return (
<div>
<div ref=componentRef className="invoice-container">
/* Your complex React Invoice HTML/CSS here /
<h1>Invoice #123</h1>
/ ... */
</div>
<button onClick=handlePrint>Print / Save as PDF</button>
<button onClick=handleDownload>Download Exact PDF</button>
</div>
);
;

Without structured learning, you will hit these walls: PDF basics

Goals: Understand what a PDF actually is (not just a picture).

JavaScript Context:

Hands-On Exercise: Use console.log to inspect bytes of a sample PDF.

Generating a PDF is only half the battle. You must display it inside your web app without forcing a download.

Javascript Pdf Course May 2026

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