A dashboard for monitoring Socket.io connections in real-time. Install @socket.io/admin/ui, instrument your io instance with basic auth. View active connections, rooms, events, and disconnect users. Useful for debugging and monitoring production.
Use io.use() middleware: read the token from socket.handshake.auth.token, verify with jwt.verify(), find the user, and attach to socket.user. The client passes the token in the auth option: io(url, { auth: { token } }). Handle connect_error for auth failures.
Pass cors option when creating the server: socketio(server, { cors: { origin: process.env.CLIENT_URL, methods: ['GET', 'POST'], credentials: true } }). Use a specific origin (not '*'), and enable credentials for cookie-based auth. Never combine origin: '*' with credentials: true.
Use socket.use() middleware to check a rate limit map per user. Track event count and start time. If count exceeds the limit within the window, return next(new Error('Rate limit exceeded')). This prevents abuse like spamming messages.
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