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home / developersection / interviews / how do clients connect to a signalr hub and send messages?
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Utpal Vishwas
Utpal Vishwas

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I am Utpal Vishwas from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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1 Answers

Utpal Vishwas
Utpal Vishwas 21 May 2025
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1. Client Connects to the SignalR Hub

  • Clients use the SignalR client library to establish a connection to the hub endpoint exposed by the server.
  • The connection is built using the hub URL, then started asynchronously.

Example (JavaScript client):

// Create a connection to the hub endpoint
const connection = new signalR.HubConnectionBuilder()
    .withUrl("/chatHub")     // URL of the hub on the server
    .build();

// Start the connection
connection.start()
    .then(() => console.log("Connected to SignalR Hub!"))
    .catch(err => console.error("Connection error: ", err));

2. Listening for Server Messages

  • Clients can register handlers for messages (methods) that the server will call.
  • This is done using .on("methodName", callback).
connection.on("ReceiveMessage", (user, message) => {
    console.log(`${user}: ${message}`);
    // You could also update your UI here to show the message
});

3. Sending Messages to the Server

  • Once connected, clients can invoke methods on the server hub using .invoke("MethodName", args...).
  • These method names correspond to public methods defined in your Hub class on the server.
function sendMessage() {
    const user = "Alice";
    const message = "Hello from client!";
    connection.invoke("SendMessage", user, message)
        .catch(err => console.error(err.toString()));
}

Summary of the Flow

Step What happens
1. Create connection Build connection with HubConnectionBuilder
2. Start connection Connect asynchronously with connection.start()
3. Register handlers Use connection.on() to handle server messages
4. Send messages Use connection.invoke() to call server hub methods
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