WebSocket: error event

{{APIRef("WebSockets API")}}{{AvailableInWorkers}}

The error event is fired when a connection with a WebSocket has been closed due to an error (some data couldn't be sent for example).

Syntax

Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.

addEventListener("error", (event) => { })

onerror = (event) => { }

Event type

A generic {{domxref("Event")}}.

Examples

// Create WebSocket connection
const socket = new WebSocket("ws://localhost:8080");

// Listen for possible errors
socket.addEventListener("error", (event) => {
  console.log("WebSocket error: ", event);
});

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• WebSocket: close event
• WebSocket: message event
• WebSocket: open event
• Writing WebSocket client applications