Devtools protocol monitor in JS

devtools-monitor.js

const ws = new WebSocket('http://localhost:9222/json');

ws.on('open', () => {
    ws.send(JSON.stringify({
        id: 1,
        method: 'Runtime.evaluate',
        params: {
            expression: 'document.title'
        }
    }));
}).on('message', data => {
    data = JSON.parse(data);

    console.log(data.result.result.value);
});