JavaScript - WebSockets & Streaming

Overview

Estimated time: 15–20 minutes

WebSockets enable real-time, two-way communication. Streaming APIs allow processing data as it arrives.

Learning Objectives

• Open and use a WebSocket connection.
• Work with streaming data in JavaScript.

Prerequisites

• JavaScript - Workers & Geolocation

WebSockets

const ws = new WebSocket('wss://echo.websocket.org');
ws.onopen = () => ws.send('Hello!');
ws.onmessage = e => console.log(e.data);

Streaming APIs

fetch('https://example.com/stream')
  .then(response => response.body.getReader())
  .then(reader => {/* ... */});

Common Pitfalls

• WebSockets require server support and may be blocked by firewalls.

Summary

WebSockets and streaming APIs are essential for real-time and large-data web applications.