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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/error_event below:

WebSocket: error event - Web APIs

WebSocket: error event

Baseline Widely available

Note: This feature is available in Web Workers.

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 addEventListener(), or set an event handler property.

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

onerror = (event) => { }
Event type

A generic 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 Browser compatibility See also

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