test.html

<input type="button" id="basicFetchButton" value="Try it">
<textarea rows="10" cols="50" name="response">
No REST calls yet
</textarea>
<script>
    document.getElementById("basicFetchButton").addEventListener("click", function(){
        theResponse = "Sending REST API Request. No Response";
//        var data = new FormData();
//        data.append("user_email", "funcky_funcky@hotmail.com");
//        data.append("password", "BI11**er");
//        console.log(data);
        var data = JSON.stringify({"user_email":"funcky_funcky@hotmail.com","password":"BI11**er","remember_me":false});
        // Loading the jQuery code
        fetch("https://api.frink.global/login", {
            method: 'post',
            body: data,
            cache: "no-cache",
            contentType: "application/json"
        })
            .then(httpResponse => { console.log(httpResponse);});

        /*            .then(function (response) {
         response.text().then(function (responseText) {
         theResponse = responseText;
         console.log(responseText);
         alert("Login Response: " + responseText);
         });
         });
         */
    });
</script>