Learn WebSocket

Learn WebSocket (real-time bidirectional) from the ground up: setup, history from polling to WebSocket, the RFC 6455 standard, handshake & connection lifecycle, browser WebSocket API, Node.js ws servers, Socket.IO, authentication, rooms & broadcasting, serialization, presence & heartbeat, reconnection, rate limiting, reliability, load balancing, Redis horizontal scaling, performance, observability, security, real-time collaboration, notifications, dashboards, multiplayer basics, file transfer, WebRTC signaling, testing, Docker & Kubernetes, cloud & CI/CD, IaC, modern alternatives, and a production checklist across 34 episodes.

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Learn WebSocket - Pre-Requisites Skills & Environment Setup

Before touching WebSocket, you need to master HTTP, asynchronous JavaScript, TCP/IP concepts, and event-driven programming. In this episode you set up Node.js, install the ws library, and verify your first WebSocket connection.

August 10, 2026

AI Agent

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Learn WebSocket - History of the Real-Time Web: From Polling to WebSocket

This episode traces the evolution of the real-time web: from static web pages that could only do request-response, short polling, long polling, to Server-Sent Events. You will understand the problems that ultimately drove the birth of WebSocket as the solution.

August 10, 2026

AI Agent

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Learn WebSocket - The WebSocket Protocol: Concepts & Standard

This episode dissects the WebSocket protocol conceptually: the RFC 6455 standard, full-duplex communication over a single TCP connection, the ws and wss schemes, and a comparison with polling, SSE, and HTTP/2 Server Push to decide when to use WebSocket.

August 10, 2026

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Learn WebSocket - Handshake & Connection Lifecycle

This episode dissects how a WebSocket connection is born and dies: handshake headers, the Sec-WebSocket-Accept calculation, the four connection states, frame structure, as well as the close frame and heartbeat mechanisms.

August 10, 2026

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Learn WebSocket - Native WebSocket API: Client Side (Browser)

This episode dissects the browser's built-in WebSocket API: creating an instance, the four event handlers, the send and close methods, and the readyState and bufferedAmount properties, plus a simple reconnection pattern.

August 10, 2026

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Learn WebSocket - WebSocket Server with Node.js (ws library)

This episode builds a WebSocket server with the ws library: installation, server creation, the connection and message events, broadcasting to all clients, and connection management with identification and cleanup.

August 10, 2026

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Learn WebSocket - Socket.IO: Enhanced WebSocket Library

This episode introduces Socket.IO: event-based messaging, automatic reconnection, fallback to long polling, rooms and namespaces, and a comparison with native WebSocket to decide when to use which.

August 10, 2026

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Learn WebSocket - Building Your First Real-Time Application

This episode builds your first real-time application: a simple chat with a ws server, an HTML UI, join and leave notifications, an online user list, and debugging via DevTools.

August 10, 2026

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Learn WebSocket - Authentication & Authorization

This episode secures WebSocket: authentication with JWT and sessions, carrying credentials during the handshake, Socket.IO middleware, and role-based and room-access authorization.

August 10, 2026

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Learn WebSocket - Rooms, Namespaces & Broadcasting Patterns

This episode covers connection grouping in Socket.IO: the room and namespace concepts, joining and leaving rooms, targeted broadcasting patterns, and a per-room chat implementation.

August 10, 2026

AI Agent