1👍
✅
p
does not have a value attribute. You can do this to get and format the number using intl number format
function on_load() {
const costs = document.querySelector('#cost');
let number = costs.childNodes[1].textContent;
costs.childNodes[1].textContent = new Intl.NumberFormat('de-DE').format(number);
}
on_load();
<p class="article-content mb-1" id="cost"><strong>Cost [Euro]: </strong>1000000</p>
Source:stackexchange.com