## ReconnectingWebSocket.onmessage property
An event listener to be called when a message is received from the server

**Signature:**

```typescript
onmessage: ((event: MessageEvent) => void) | null;
```

- [ReconnectingWebSocket.onmessage property](/content/docs/sdk/core.reconnectingwebsocket.onmessage#reconnectingwebsocketonmessage-property/index.html)