To find the coordinates of the cursor in JavaScript, use event.clientX and event.clientY. You can try to run the following code to get cursor coordinates in JavaScript.
Example
<!DOCTYPE html>
<html>
<head>
<script>
function coordinatesFunc(event) {
document.write("Coordinate(X) = " + event.clientX + "<br>Coordinate(Y) = " + event.clientY);
}
</script>
</head>
<body>
<div onmousedown="coordinatesFunc(event)">Click me to get coordinates of cursor</p>
</body>
</html>