Sending message to a specific connected users using webSocket?

Question

I wrote a code for broadcasting a message to all users:

// websocket and http servers
var webSocketServer = require(\'websocket\').server;

...
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Answer 1

For people using ws version 3 or above. If you want to use the answer provided by @ma11hew28, simply change this block as following.

webSocketServer.on('connection', function (webSocket) {
  var userID = parseInt(webSocket.upgradeReq.url.substr(1), 10)

webSocketServer.on('connection', function (webSocket, req) {
  var userID = parseInt(req.url.substr(1), 10)

ws package has moved upgradeReq to request object and you can check the following link for further detail.

Reference: https://github.com/websockets/ws/issues/1114