The WebSocket onerror event is triggered when an error occurs with the WebSocket connection. This can happen due to various reasons such as network issues, server errors, or invalid data being sent or received.
When the onerror event is triggered, it provides an Event object that contains information about the error. Developers can use this information to handle the error appropriately, for example by logging the error message or displaying a warning to the user.
It is important to note that once an error occurs with a WebSocket connection, it cannot be recovered. The developer must create a new WebSocket object and establish a new connection if they wish to continue using WebSockets.