This article explores the top eight WebSocket libraries for Node.js, including Socket.IO, WS, SockJs, Feathers, µWebSockets, Faye-WebSocket, Primus, and SocketCluster. Each library has its own strengths and weaknesses, making it crucial to choose one that best fits your project's requirements. WebSockets enable bidirectional communication between a server and client, allowing for realtime updates in applications like chat apps, online gaming, live notifications, collaborative tools, and financial trading platforms. The article also discusses the advantages of using Ably as an alternative to traditional WebSocket libraries, offering scalability and efficiency through its integration with the Pub/Sub model.