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Colyseus

Authoritative multiplayer game server framework for Node.js

Game Servers ★ 7.4k stars Medium setup MIT

Colyseus is an open-source multiplayer game server framework for Node.js that handles authoritative state synchronization, rooms, and matchmaking. It powers realtime browser and engine-based games and is fully self-hostable.

Official siteSource code

Key features

  • Authoritative state sync
  • Room and matchmaking model
  • Engine-agnostic clients
  • Self-hostable backend

Strengths

  • Released under the MIT license
  • First-class Docker support for quick deployment
  • Mature project with 7.4k GitHub stars
  • Written in TypeScript

Is Colyseus secure?

OSV.dev has no published security advisories for Colyseus's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Colyseus replaces

Self-hosted Photon Engine alternatives

Health badge

Maintain Colyseus? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 91 · excellent

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