gistfile1.js

var WebSocket = require('ws');

lastId = 1;

var ws = new WebSocket('ws://localhost:9222/devtools/page/1');

ws.on('error',function(error) {
  console.log('error', error);
});

ws.on('message', function(message) {
  var msg = JSON.parse(message)
  console.log(msg)
});

function send(method, data) {

  var req = {
    method: method,
    params: data,
    id: lastId
  }
  ws.send(JSON.stringify(req));

  lastId++;
}

ws.on('open', function(err) {
  send('Inspector.enable')
  send('Debugger.enable')
  send('Debugger.setPauseOnExceptions', {
    state: 'none'
  })

  send('Debugger.setBreakpointsActive', { 
    active: true // Tada! 🎉🎉🎉
  })
  
})