<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

<script>

    $.ajax({
        url: "https://api.weatherunlocked.com/api/current/51.5,-0.1?app_id={APP_ID}&app_key={APP_KEY}",
        type: "GET",
        success: function (parsedResponse, statusText, jqXhr) {

            console.log(parsedResponse);

        },
        error: function (error) {

            console.log(error);
        }
    });

</script>