WebSockets
Socket.io, gateways, events, rooms, namespaces, authentication, broadcasting
1What is a WebSocket Gateway in NestJS?
What is a WebSocket Gateway in NestJS?
Antwort
A WebSocket Gateway is a class decorated with @WebSocketGateway() that handles WebSocket connections and real-time events. It acts as an entry point for bidirectional communication between server and clients. Gateways use Socket.io by default and allow handling incoming and outgoing events via decorators like @SubscribeMessage().
2Which library does NestJS use by default for WebSockets?
Which library does NestJS use by default for WebSockets?
Antwort
NestJS uses Socket.io by default for WebSockets. Socket.io provides advanced features like rooms, namespaces, automatic reconnection and long-polling fallback. It's possible to use ws (native WebSocket) by specifying the adapter, but Socket.io remains the recommended choice for most use cases.
3How to listen to a WebSocket event in a NestJS Gateway?
How to listen to a WebSocket event in a NestJS Gateway?
Antwort
To listen to an event, use the @SubscribeMessage('eventName') decorator on a Gateway method. The method automatically receives data emitted by the client. The decorator handles event registration and allows returning a response to the client or broadcasting to multiple clients.
Which lifecycle method allows executing code when a client connects to the Gateway?
What is a Room in Socket.io?
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