Socket.IO Rooms: Broadcasting to Subsets of Clients
Think of Socket.IO Rooms as server-side channels for grouping clients. They let you broadcast messages to a specific subset, like a private chat or users following a topic. Remember rooms are a server-only concept; a client can't see which rooms it has joined.
Think of Socket.IO Rooms as server-side channels for grouping clients, letting you broadcast messages to a specific subset instead of all connected sockets. This is the core mechanism for features like private chats or topic-based notifications. Use rooms to send an event to all of a single user's open tabs by joining them to a room named with their user ID, or to notify all users interested in a specific project. The main footgun: rooms are a server-only concept, and the default in-memory adapter won't work across multiple server instances.
Read the original → socket.io
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