ws-test.js

const WebSocket = require('ws');

for (i=0; i < 50; i++) {
    let ws = this.ws = new WebSocket("ws://localhost:9001/");
    ws.onopen = (event) => {
      console.log("Websocket opened");
      ws.send("This is the first message that was sent");
      ws.send("This is the second message that was sent");
    };

    ws.on('message', function incoming(data) {
      console.log(data);
    });

    setTimeout(function(i) {
        ws.close()
    }, 5000 + i*1000);

    ws.onclose = (event) => {
        console.log("WebSocket closed")
    }
}