Websocket how to change incoming message?

Question

JavaScript

Hello. I am writing a chrome extension. It is required to be embedded in websocket and modify incoming messages.
There are no problems with listening. You can listen through WebSocket.prototype.onMessage or by adding a listener to the message event:
WebSocket.addEventListener('message'...
The problem is that in both cases the text of the incoming message is readOnly. Are
there any ways to modify the incoming message?
I was thinking about making a local websocket proxy in browser, but as I understand it, in chrome it is impossible to raise
the websocket server?

Answer 1

https://learn.javascript.ru/websocket

Answer 2

try replacing the method with your own, something like this:
https://stackoverflow.com/questions/40341197/how-t...

WebSocket.prototype.oldSend = WebSocket.prototype.send;

WebSocket.prototype.send = function(data) {
     console.log("ws: sending data");
     WebSocket.prototype.oldSend.apply(this, [data]);
};