bfx_test_auth_ws_v2.js

// npm install ws crypto-js

const WebSocket = require('ws')
const crypto = require('crypto-js')

const apiKey = ''
const apiSecret = ''

const authNonce = Date.now() * 1000
const authPayload = 'AUTH' + authNonce
const authSig = crypto
  .HmacSHA384(authPayload, apiSecret)
  .toString(crypto.enc.Hex)

const wss = new WebSocket('wss://api.bitfinex.com/ws/2')
wss.onmessage = (msg) => console.log(msg.data)
wss.onopen = () => {
  const payload = {
    apiKey,
    authSig,
    authNonce,
    authPayload,
    event: 'auth'
  }

  wss.send(JSON.stringify(payload))
}