How can I implement WebSocket middleware in my application?

How can I implement WebSocket middleware in my application?

To implement WebSocket middleware, you can use libraries like Socket.IO or ws in Node.js. Do you have a specific framework in mind?

I'm using Express.js. Can you provide a code example?

Sure! Here's a simple example:

const express = require('express');
const http = require('http');
const WebSocket = require('ws');

const app = express();
const server = http.createServer(app);
const wss = new WebSocket.Server({ server });

wss.on('connection', (ws) => {
    ws.on('message', (message) => {
        console.log('received: %s', message);
    });
    ws.send('Hello! Message from server.');
});

server.listen(3000, () => {
    console.log('Server is listening on port 3000');
});

This sets up a WebSocket server with Express. Would you like to know more about handling messages?

Yes, how do I handle different types of messages?

You can handle different message types by parsing the incoming message and using a switch statement. For example:

ws.on('message', (message) => {
    const data = JSON.parse(message);
    switch(data.type) {
        case 'greeting':
            ws.send('Hello!');
            break;
        case 'farewell':
            ws.send('Goodbye!');
            break;
        // Add more cases as needed
    }
});