Captcha for proxy-anon

const express = require('express')
const captchaGenerator = require('captchagen')

const port = 3000

const app = express()

app.get('/', (req, res) => {
  const russianAlphabet = 'абвгдеёжзийклмнопрстуфхцчшщъыьэюя'
  const captchaLength = 6
  let captchaText = ''

  while (captchaText.length < captchaLength) {
    captchaText += russianAlphabet[Math.floor(Math.random() * russianAlphabet.length)]
  }
  const captcha = captchaGenerator.create({
    text: captchaText
  })

  console.log(captcha.text())

  captcha.generate()

  res.set('Content-Type', 'image/png')

  res.send(Buffer.from(captcha.buffer()))
})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})