Question 1

How to scale Socket.IO across multiple servers?

Accepted Answer

Use adapters like Redis to synchronize events between nodes. Configure the Socket.IO server with the adapter and ensure load balancers support WebSocket with sticky sessions for consistent connections.

Question 2

Socket.IO vs pure WebSocket: which is better for my app?

Accepted Answer

Socket.IO is better for reliability with fallbacks and built-in features like rooms, while pure WebSocket offers lower latency and smaller bundles. Choose based on your need for compatibility versus performance.

Question 3

How to handle user authentication with Socket.IO?

Accepted Answer

Authenticate during the connection handshake using middleware. Pass tokens via query parameters or headers and validate on the server before allowing socket connections to proceed.

Question 4

Can Socket.IO work with React or Vue.js?

Accepted Answer

Yes, use the socket.io-client package to integrate with any frontend framework. Manage socket connections in component lifecycles for real-time updates in your UI.

Question 5

How to broadcast messages to specific rooms in Socket.IO?

Accepted Answer

On the server, use methods like io.to('roomName').emit('event', data) to send messages to all sockets in a room, leveraging the built-in room support for targeted communication.

Question 6

Socket.IO reconnection keeps failing, how to fix it?

Accepted Answer

Check network issues and server availability. Adjust reconnection attempts and timeouts in client settings, and refer to the troubleshooting guide in the documentation for common pitfalls.

Socket.io

What is Socket.io?

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