How to change pug after first sending it in NodeJS

Question

Somehow, I can't seem to change anything after first sending my pug file. I have an array of image URLs and am sending it to pug and receiving it in pug like this:

function putnewvalsinpug() {
db.get('URL', function (err, value) {
    if (err) return console.log('', err);
    var newnewval = ""
    data = value;
    data = data.toString()
    var stringArray = data.split(" ");
    console.log(stringArray);
    app.get('/', (req, res) => {
        res.render('index', {imgsrcs: stringArray});
    });
})
}

    each image in imgsrcs
      a(href=image)
        img(src=image) 

when I add a URL to the database, I want my website to show the additional images after a refresh, but it only shows the new images after a server restart. I have tried running putnewvalsinpug() after adding an URL to the database and not only on startup, but that did not work.