pw.addEventListener('input', check); pw2.addEventListener('input', check);

// server.js const express = require('express'); const crypto = require('crypto'); const argon2 = require('argon2'); const bodyParser = require('body-parser'); const pool = require('./db'); // assume pg pool const rateLimit = require('express-rate-limit');

validate();

const app = express(); app.use(bodyParser.json());

app.listen(3000); Frontend (HTML + minimal JS)