[HTML] pobierz, plaintext 
<script src="ajax.js">
var jsonData.push("lastname" : "nazwisko" );
</script>
[HTML] pobierz, plaintext 

window.addEventListener('load', function()
{
    var xhr = null;

    getXmlHttpRequestObject = function()
    {
        if(!xhr)
        {
            // Create a new XMLHttpRequest object.
            xhr = new XMLHttpRequest();
        }
        return xhr;
    };
    updateLiveData = function()
    {xhr = getXmlHttpRequestObject();
xhr.open("POST", "mojasytona.pl/api.php", true);
var jsonData = {"name" : "imię" };
xhr.send(JSON.stringify( jsonData ));
    }
});