TypeError: $.parseJSON is not a function

var WebSocketClient = require('websocket').client;
var $ = require('jquery');
var client = new WebSocketClient();
 
client.on('connect', function(connection) {
    console.log('WebSocket Client Connected');
    connection.on('error', function (error) {
        console.log("[ERROR]Connection Error: " + error.toString());
    });
    connection.on('close', function () {
        console.log('[WARNING] echo-protocol Connection Closed');
    });
    connection.on('message', function (message) {
        if (message.type === 'utf8') {
            //console.log("Received: '" + message.utf8Data + "'");
            var string = message.utf8Data;
            var dannie = $.parseJSON(string);
            console.log(dannie.online);
        }
    });
});
client.connect('ws://node.csgohot.com:8083/', 'echo-protocol');

var s='{
    "key": "value"
}';
var r = JSON.parse(s)
console.log(r) // {key: "value"}  - объект