require Express and ejs library. code example
Example 1: ejs current year
<%= new Date().getFullYear();%>
Example 2: how to use ejs with client side ejs
<div id="output"></div>
<script src="ejs.min.js"></script>
<script>
let people = ['geddy', 'neil', 'alex'],
html = ejs.render('<%= people.join(", "); %>', {people: people});
// With jQuery:
$('#output').html(html);
// Vanilla JS:
document.getElementById('output').innerHTML = html;
</script>