Hardening Real-Time Matching Systems with Node.js and WebSockets

A practical architecture guide for securing and scaling real-time WebSocket applications built with Node.js, using a matchmaking system as the example. Covers establishing server-owned sessions, validating and dispatching messages safely, authenticating before expensive work, rate-limiting individual actions rather than just connections, enforcing state machine transitions, making cleanup idempotent, detecting dead connections via heartbeats, applying backpressure under load, managing outbound buffer overflow, separating commands from events, minimizing broadcasted data, handling reconnection deliberately, moving counters to shared infrastructure like Redis when scaling horizontally, and instrumenting rejected operations alongside successes. Emphasizes treating every WebSocket message as untrusted input and designing for eventual disconnection.

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