WebSockets enable bidirectional, real-time communication between clients and servers. Here's how to implement them effectively.
Basic WebSocket Server
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Socket.io Implementation
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Client Implementation
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Scaling with Redis
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Presence System
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Room-Based Chat
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Error Handling and Reconnection
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Best Practices
Connection:
✓ Implement authentication
✓ Handle reconnection gracefully
✓ Use heartbeats for presence
✓ Clean up on disconnect
Scaling:
✓ Use Redis adapter for multiple instances
✓ Implement sticky sessions or Redis
✓ Monitor connection counts
✓ Set appropriate timeouts
Performance:
✓ Batch messages when possible
✓ Use binary data for large payloads
✓ Implement message compression
✓ Rate limit messages per client
Conclusion
WebSockets enable powerful real-time features. Use Socket.io for easier handling, Redis for scaling, and implement proper presence and reconnection logic. Monitor connection health and plan for graceful degradation when WebSockets aren't available.