wss.clients undefined - node.js

Question

I'm a beginner of node.js. Recently, I'm trying to use node.js to build a WebSocket server. Here is my code(simplified) and question.

const https = require('https');
const WebSocket = require('ws');
const wss = new WebSocket.Server({port: 3000});
......

wss.on('connection',wss => {
  console.log("Connected.");
  console.log("wss.clients"); //undefined
});

......

I wanna print all clients in the console, but the console printed "undefined". I searched on the web and connot find a way to solve it.

Answer 1

firstly, according to 'ws' npm package , you should use WebSocketServer :

const WebSocket = require('ws');
const wss = new WebSocket.WebSocketServer({port: 3000});

secondly, you should use different name for the callback parameter:

wss.on('connection', socket => {
});

finally:

// console.log("wss.clients");
console.log(wss.clients);