SocketXO
A browser-based real-time Tic-Tac-Toe web application demonstrating production-grade real-time system behavior.
Overview
What it does
SocketXO is a browser-based real-time Tic-Tac-Toe web application created to demonstrate production-grade real-time system behavior. Its primary focus is connection resilience, server-authoritative state management, and deterministic synchronization between connected clients.
The application provides frictionless matchmaking, secure room-scoped chat, an AI benchmark mode using a deterministic Minimax engine, and developer tools for simulating network failures. These features are designed to demonstrate reliable real-time multiplayer behavior.
The architecture follows a state-first, server-authoritative model where the backend acts as the single source of truth. Real-time communication is event-driven with Socket.io, persistent player identities enable reconnection, and the frontend reactively updates from server-broadcasted state.
Problem and solution
Problem
Real-time multiplayer applications must maintain synchronized game state and recover reliably from network interruptions without causing inconsistent client state.
Solution
SocketXO uses a server-authoritative architecture with deterministic state synchronization and a managed disconnect recovery mechanism that preserves sessions during temporary network loss.
Highlights
- 01 30-second disconnect recovery handshake
- 02 Server-authoritative game state validation
- 03 Global matchmaking queue
- 04 Room-scoped real-time chat with XSS sanitization
- 05 Deterministic Minimax AI benchmark mode
- 06 Developer controls for simulating lag and disconnects
Features
Disconnect Handshake
Holds a disconnected player's session for 30 seconds, notifies the opponent, and restores the game state when the player reconnects.
Server-Authoritative State Engine
Validates every move on the server, maintains synchronized game state, and rejects invalid actions.
Frictionless Matchmaking
Creates guest identities and pairs players through a global matchmaking queue.
Room-Scoped Chat
Provides in-game chat with XSS sanitization for secure communication.
AI Benchmark Mode
Includes a deterministic Minimax AI mode for testing game logic correctness.
Dev-Mode Chaos Controls
Provides hidden developer controls to simulate lag and disconnect scenarios.
Architecture
Uses a reactive state synchronization approach where UI components update from server-broadcasted state.
Implements a state-first, server-authoritative architecture that validates game logic and maintains session state.
Real-time communication is event-driven through Socket.io with a shared event contract.
Players use persistent session-based identities with short-lived reconnection tokens for managed recovery.
Screenshots
Web
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