onMessage fired twice when receiving Json data

[sbland]

When receiving a message that is a stringified json object the onMessage function is called twice. First with the string version and then with the string parsed to a JSON object.

Server setup:

var server = require('websocket').server;
var socket = new server({
    httpServer: http.createServer().listen(8008),
});
socket.on('request', function(request) {
    const connection = request.accept(null, request.origin);
    connection.send("{\"test\":\"message\"}");
})

Client setup

const WebsocketManagerFunc = () => {
  const messageReceived = (data) => {
    console.log('received data');
    console.log(data);
    console.log(typeof data);
  };

  return (
    <Websocket
      url={`ws://localhost:8008/`}
      onMessage={messageReceived}
    />
  );
};

console log

Websocket connected
received data
{"test":"message"}
string
received data
{test: "message"}
object