Browser APIs & Web Features

Learn how to create a live, real-time chat application in JavaScript using the WebSocket protocol from scratch, no frameworks required. Introduction We live in an era where users expect instant updates, whether it’s new messages, notifications, or multiplayer game moves. If you’ve ever wondered how chat apps like WhatsApp Web or Slack exchange messages instantly,…

Learn how to go from zero setup to a working real-time chat app using pure JavaScript and WebSockets, no frameworks, no magic. Introduction Most web apps today talk back to the user instantly, messages appear without refreshing, dashboards update live, and notifications pop up in real time. If you’ve ever wondered how that magic happens, it’s…

Understand the real differences between SSE and WebSockets and learn when to pick each for real-time web features. Introduction So you want real-time updates in your web app.Maybe it’s a live chat, a stock ticker, a multiplayer dashboard, or a push notification system. You’ve probably come across two main technologies for this: Server-Sent Events (SSE)…

Learn how Server-Sent Events and WebSockets work, their key differences, and how to pick the right one for your real-time web app. Introduction Modern users expect real-time experiences, think live chats, notifications, stock tickers, or collaborative editors. As JavaScript developers, we have two main tools to make that happen: Both let you send data from the…

Understand the real differences between SSE and WebSockets and learn when to pick the right one for your real-time JavaScript app. Introduction Modern users expect everything to happen instantly, chats updating in real time, dashboards refreshing automatically, or stock prices streaming live. As developers, we reach for two tools to make that happen: Server-Sent Events…

A complete, practical guide to understanding real-time communication on the web with examples, pros, cons, and use cases. Introduction We live in a real-time world, live chats, notifications, dashboards, and multiplayer apps all expect instant updates. Traditional HTTP requests are one-way: the client asks, the server responds, and the connection ends. That’s fine for static pages,…

Both can make your app real-time, but sometimes, simpler is smarter. Introduction If you’ve ever built a real-time app, a chat, a dashboard, a notification system, or a live tracker, you’ve probably faced this question: “Should I use WebSockets or Server-Sent Events (SSE)?” Most developers immediately reach for WebSockets because they sound cooler: “real-time,” “bi-directional,” “persistent…

Learn how to make multiple tabs talk to each other, no backend, no frameworks, just pure JavaScript. Introduction Open your app in two browser tabs, make a change in one, and the other still shows old data, frustrating, right? Whether it’s dark mode toggles, logout events, or live cart updates, browser tabs don’t share state…

Keep multiple tabs instantly in sync, no server, no frameworks, just pure JavaScript magic. Introduction Ever opened your app in two browser tabs, updated something in one tab, and then wondered why the other one didn’t update too? Whether it’s user preferences, dark mode settings, logout status, or shopping cart data, keeping multiple tabs in…

It’s 2025, stop manually calculating scroll positions. The browser can handle visibility detection for you automatically. Introduction If you’ve ever built “lazy loading,” “infinite scrolling,” or “animate on scroll” features,you’ve probably written something like this: window.addEventListener(“scroll”, () => { const rect = el.getBoundingClientRect(); if (rect.top < window.innerHeight) loadImage();}); It works… but it’s not pretty. Every…