How to Use SignalR Connection IDs in JavaScript?

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SignalR is a real-time communication library for ASP.NET that can be used to build real-time web applications. In SignalR, each client that connects to the server is assigned a unique connection ID, which can be used to identify the client and send messages to it.

To use SignalR connection IDs in JavaScript, you first need to establish a connection to the SignalR server:

var connection = new signalR.HubConnectionBuilder()

connection.start().catch(function (err) {
    return console.error(err.toString());

In this example, a new SignalR connection is established using the signalR.HubConnectionBuilder method, and the URL of the SignalR server is specified with the withUrl method. The start method is then called to start the connection, and an error handler is added to catch any errors that occur during the connection process.

Once the connection is established, you can use the property to access the unique connection ID for the current client:

console.log("My connection ID is: " +;

In this example, the connection ID is logged to the console for demonstration purposes. In a real-world application, you would likely use the connection ID in a more meaningful way, such as sending messages to specific clients based on their connection ID.

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