JSFiddle - React, Tailwind, and code Playground

JavaScript

$(function(){
    $.ajax({
    type: 'POST',
    url: 'http://www.belardi.ro/userTrack/addData.php',
    crossDomain: true,
    data: {"some":"json"},
    dataType: 'json',
    success: function(responseData, textStatus, jqXHR) {
        var value = responseData.someKey;
    },
    error: function (responseData, textStatus, errorThrown) {
        alert('POST failed.');    }
});
    
});