.js

let estate;
let signed;
let watches;

function getImagesAndServePages() {
    estate = require('fs').readdirSync('./public/imgs/estate');
    signed = require('fs').readdirSync('./public/imgs/signed');
    watches = require('fs').readdirSync('./public/imgs/watches');
}

getImagesAndServePages();

setInterval(() => {
    getImagesAndServePages();
}, 1000 * 60);

app.get('/', (req, res) => {
    res.render('pages/index');
 });

 app.get('/estate', (req, res) => {
     res.render('pages/estate', {imgs: estate});
 });

 app.get('/signed', (req, res) => {
     res.render('pages/signed', {imgs: signed});
 });

 app.get('/watches', (req, res) => {
     res.render('pages/watches', {imgs: watches});
 });