How to store Geolocation coordinates in mongoDB database using below code?

i. e. Geolocation get stored after user clicks the button. I didn't understand how to send this coordinates to the post route. Please help me out.

<p>Click the button to get your coordinates.</p>

<button onclick="getLocation()">Try It</button>

<p id="demo"></p>

<script>
    var x = document.getElementById("demo");

    function getLocation() {
        if (navigator.geolocation) {
            navigator.geolocation.getCurrentPosition(showPosition);
        } else {
            x.innerHTML = "Geolocation is not supported by this browser.";
        }
    }

    function showPosition(position) {
        x.innerHTML = "Latitude: " + position.coords.latitude +
            "<br>Longitude: " + position.coords.longitude;
    }
</script>