Building a Real-Time Cryptocurrency Price Tracker with WebSockets

Introduction Tracking cryptocurrency prices in real-time is essential for traders and investors. In this tutorial, we will build a lightweight price tracker using WebSockets. Why WebSockets? Traditional HTTP polling wastes bandwidth and introduces latency. WebSockets provide full-duplex communication, enabling instant price updates. Architecture Overview Client (Browser) <--WebSocket--> Server <--WebSocket--> Exchange API Setting Up the Server const WebSocket = require ( " ws " ); const server = new WebSocket . Server ({ port : 8080 }); server . on ( " connection " , ( ws ) => { console . log ( " Client connected " ); // Forward price data to clients const exchangeWS = new WebSocket ( " wss://stream.binance.com:9443/ws/btcusdt@trade " ); exchangeWS . on ( " message " , ( data ) => { const trade = JSON . parse ( data ); ws . send ( JSON . stringify ({ symbol : trade . s , price : parseFloat ( trade . p ), time : trade . T })); }); }); Building the Frontend <div id= "price-display" > <h1