Docs

LobbyLab is a hosted multiplayer backend. Your game keeps its own UI, engine and domain; players join LobbyLab rooms over WebSockets, and LobbyLab keeps the rooms, invite codes, matchmaking and shared game state. The Multiplayer API is in private alpha: request a key.

llms.txtEvery doc in one fileError codes

• QuickstartWhat LobbyLab's Multiplayer API does, what works today, what arrives with the alpha, and the planned client API.
• Client SDKThe planned @lobbylab/client API: sign-in, rooms, shared state, messages and host controls, and @lobbylab/node for your backend.
• RoomsThe room lifecycle: phases, members, joining, reconnection, how rooms end, turn-based and live rooms, and limits.
• Wire protocolmultiplayer-wire/v0: the handshake, messages and close codes, for a client in any language.
• API referenceThe Multiplayer API's REST routes, keys, tokens and the error envelope.
• Error codesEvery Multiplayer API and build check error code, with what it means and what to do.
• For coding agentsSet up LobbyLab's MCP server in Claude Code, Codex, Cursor and VS Code, and the rules for agents.
• StatusWhat is live, what is in alpha and what is planned.