JavaScript
17 articles tagged with javascript.
How to Build a Browser-Based PDF Crop Tool Using JavaScript
PDF files often contain unwanted margins, blank spaces, scanner borders, page headers, page footers, or unnecessary content around the main document area. Cropping allows users to remove these unwante
Why I still teach Singleton even though modules make it redundant
Ask any developer what design pattern they know best and Singleton comes up first. Ask the same group...
How to Build a Case Converter Tool Using HTML, CSS, and JavaScript
If you're looking to level up your front-end development skills by building a practical web utility, this is the guide for you. We'll code a fully functional Case Converter Tool from scratch using onl
Frontend System Design: Designing a Collaborative Whiteboard
A walkthrough of designing a real-time collaborative whiteboard from a blank page to a production-ready architecture.
How to Build a Browser-Based PDF Metadata Editor Using JavaScript – A Step-by-Step Guide
PDF files contain more information than what appears on the page. Behind every PDF document is metadata that stores information such as the document title, author, subject, keywords, creator applicati
How to Understand the Safe Integer Limit in JavaScript
According to the Stack overflow technology survey in 2025, JavaScript is one of the most widely used programming languages in the world. We use it to build frontend applications, backend services, pay
How to Build a Browser-Based PDF Organizer Tool Using JavaScript
PDF files often become difficult to manage when pages are out of order, scanned incorrectly, duplicated, or spread across multiple documents. Instead of manually recreating the document, users often n
How to Build a PDF Page Numbering Tool in the Browser Using JavaScript
When you're working with contracts, reports, invoices, manuals, or academic documents, page numbers make navigation much easier. Instead of manually editing every page, modern JavaScript libraries let
How to Build a Browser-Based PDF Rotator Using JavaScript
Sometimes PDF pages appear upside down, sideways, or in the wrong orientation after scanning or exporting documents. Instead of re-creating the document manually, users usually just need a quick way t
Think Like the JavaScript Engine
Most developers learn JavaScript by memorizing rules and copying framework patterns. But when a weird production bug hits or a senior engineer asks a deep architectural question during an interview, s
How to Build a Browser-Based PDF Watermark Tool Using JavaScript
PDF watermarks are commonly used for branding, document protection, approvals, confidential files, and internal document tracking. Whether it’s adding a company logo, a “CONFIDENTIAL” label, or a draf
How to Build a Browser-Based PDF to Image Converter Using JavaScript
Whether it’s invoices, scanned documents, reports, certificates, or receipts, users often need to convert PDF pages into image files quickly. Modern browsers make this much easier than before. Instead
How to Convert Images to PDF in the Browser Using JavaScript – A Step-by-Step Guide
Whether it’s scanned documents, screenshots, receipts, notes, certificates, or multiple photos, users often need a quick way to combine images into a downloadable PDF. Modern browsers make this much e
Mastering the JavaScript Event Loop
JavaScript is famously single-threaded, yet it powers highly complex, interactive web applications without freezing up. How is this possible? The answer lies in the Event Loop. The Event Loop is a cor
How to Compress PDF Files in the Browser Using JavaScript (Step-by-Step)
PDF files are everywhere. From invoices and reports to résumés and documents, they’re one of the most common file formats we deal with. But there’s a common problem: PDFs can get large quickly. If you
How to Split PDF Files in the Browser Using JavaScript (Step-by-Step)
Working with PDFs is part of everyday development. Sometimes you don’t need the entire document. You just need a few pages — maybe a specific section, a report summary, or selected invoice pages. Most
Common React Mistakes to Avoid
By Scott Gary React is a highly popular and powerful JavaScript library for user interface development. Its component-based architecture, combined with its declarative nature, is one of the primary re…