Javascript Pdf Course Today

jsPDF creates from scratch. PDF-Lib modifies existing PDFs. Need to fill out a government form template? Add a signature to a contract? This is your library.

Installation:

npm install pdf-lib

How to fill a PDF form:

import  PDFDocument, rgb  from 'pdf-lib';
async function fillForm() 
// 1. Fetch an existing PDF template
const formUrl = '/template.pdf';
const existingPdfBytes = await fetch(formUrl).then(res => res.arrayBuffer()); javascript pdf course
// 2. Load the document
const pdfDoc = await PDFDocument.load(existingPdfBytes);
const form = pdfDoc.getForm();
// 3. Get the text fields
const nameField = form.getTextField('customer_name');
const dateField = form.getTextField('invoice_date');
// 4. Fill them
nameField.setText('John Doe');
dateField.setText(new Date().toLocaleDateString()); jsPDF  creates from scratch
// 5. Flatten (make fields non-editable)
form.flatten();
// 6. Save
const pdfBytes = await pdfDoc.save();
const blob = new Blob([pdfBytes],  type: 'application/pdf' );
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = 'filled-contract.pdf';
link.click();

You set up an Express.js cron job that queries a database every night, generates a 50-page performance report using Puppeteer (converting an internal HTML dashboard to PDF), and emails it to a distribution list. This project teaches:

Most developers start here. Using libraries like jspdf and pdf-lib, you can generate PDFs without a server round-trip.