Using WebSockets in Flutter

Real-time data applications, such as chat or IoT apps, require immediate feedback, which traditional REST APIs struggle to provide efficiently due to the need for frequent server polling. WebSockets, however, offer a solution by enabling two-way interactive communication sessions between a client and a server, allowing for event-driven responses without constant polling. This technology is ideal for applications that must handle continuous data streams, like stock exchanges or chat platforms. In the context of Flutter, the language Dart supports WebSockets through the WebSocket class, although multiplatform development requires the web_socket_channel library to accommodate both web and mobile environments. The article provides a practical example using the CoinBase Pro API to demonstrate how WebSockets can be utilized in Flutter to receive real-time cryptocurrency data. It outlines the creation of a Dart project, the connection to a WebSocket channel, and the use of StreamBuilder widgets in Flutter to manage and display incoming data streams effectively. The guide also highlights the process of closing WebSocket connections and discusses the benefits of using WebSockets for real-time data updates in applications.