How to Broadcast Messages to Multiple WebSocket Clients in Go

Broadcast messages to multiple WebSocket clients by maintaining a map of connections and iterating through it to write data to each client.

var clients = make(map[*websocket.Conn]bool)

func broadcast(message []byte) {
    for client := range clients {
        err := client.WriteMessage(websocket.TextMessage, message)
        if err != nil {
            client.Close()
            delete(clients, client)
        }
    }
}

Broadcasting messages to multiple WebSocket clients in Go keeps a list of all active user connections in memory. When you need to send a message, the server loops through that list and delivers the same data to every connected user. It works like a radio station broadcasting a single signal to every tuned-in receiver simultaneously.