CloudSQLAdminPanel/routes/captcha.js

const express = require('express');
const router = express.Router();
const svgCaptcha = require('svg-captcha');

const c = svgCaptcha.create();

router.get('/', (req, res, next) => {
    let captcha = svgCaptcha.create({
        size: 4,
        ignoreChars: '0o1ilI',
        noise: 2,
        color: true,
        fontSize: 50,
        width: 100,
        height: 36
    });
    req.session.captcha = captcha.text.toLowerCase();

    res.type('svg');
    res.status(200).send(captcha.data);
});

module.exports = router;