Foundry VTT Sockets & Multiplayer

Domain: Foundry VTT Module/System Development Status: Production-Ready Last Updated: 2026-01-04

Overview

Foundry VTT uses Socket.io for real-time communication between server and clients. Understanding socket patterns is essential for multiplayer-safe code.

When to Use This Skill

• Broadcasting events to other connected clients
• Implementing GM-delegated operations for players
• Synchronizing non-document state across clients
• Creating animations/effects visible to all players
• Avoiding duplicate execution in hooks

Socket Setup