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The Ultimate Guide to Redux

WebSocket Implementation

Explore how to implement WebSocket communication within Redux middleware to handle real-time data efficiently. Understand how to initialize WebSocket connection correctly, handle its lifecycle events like open, close, error, and message, and dispatch corresponding Redux actions to manage application state.

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As with any infrastructure-related code, middleware is the perfect place for our WebSocket implementation. Using middleware will allow us to catch any required actions sent over the network and dispatch anything coming from the server. The basic WebSocket setup is as follows:

// Basic structure of a WebSocket setup
const WS_ROOT = "ws://echo.websocket.org/";

const websocket = new WebSocket(WS_ROOT);

websocket.onopen    = () => {};
websocket.onclose   = () => {};
websocket.onerror   = event => {};
websocket.onmessage = event => {};

To make the code more readable, we can replace the four different assignments with a single use of Object.assign() and use code similar to this:

Object.assign(websocket, {
  onopen()     { },
...