ajax multiple Values

Thanks to give me the advise to work with JSON.

I Think i get it now.

Perhaps someone could look over it?

Here My Code

Button:

<div id="div3">
<button id="rob-wp-ajax-vorlage-button">ok</button>
</div>

My PHP Code

function load_my_ajax_vorlage()
{
wp_enqueue_script( 'my_custom_js', plugins_url( 'ajax-vorlage-script.js',   __FILE__ ), array('jquery'), false, false );
}
add_action('wp_enqueue_scripts', 'load_my_ajax_vorlage');
add_action( 'wp_footer', 'load_my_ajax_vorlage' );

add_action('wp_enqueue_scripts', 'example_localize_ajax');

function example_localize_ajax(){
wp_localize_script('jquery', 'ajax', array(
    'url' => admin_url('admin-ajax.php'),
    'nonce' => wp_create_nonce('example_ajax_nonce'),
));
}


//Example AJAX Function
add_action('wp_ajax_example_function', 'example_function');
add_action('wp_ajax_nopriv_example_function', 'example_function');
function example_function(){

$var1 = "value1";
$var2 = "value2";
echo json_encode(array($var1, $var2));

wp_die(); // this is required to terminate immediately and return a  proper response:- https://codex.wordpress.org/AJAX_in_Plugins
}

my JS

var ajaxurl="<?php echo admin_url("admin-ajax.php") ?>";
jQuery(document).ready(function($) {
$( '#rob-wp-ajax-vorlage-button' ).click( function() {

jQuery.ajax({
    type: "POST",
    url: ajax.url,
 dateType: 'JSON',
    data: {
        nonce: ajax.nonce,
        action: 'example_function',
        data: {
            //firstname: 'fname',
            //lastname: 'lname'
        },
    },
    success: function(response){
        console.log('Successful AJAX Call! /// Return Data: ' + response); 
        var result = $.parseJSON(response);     
        console.log('result0 ' + result[0]); 
        console.log('result1 ' + result[1]); 
         },
             error: function(XMLHttpRequest, textStatus, errorThrown){
             console.log('ERROR AJAX Call! /// Return Data: ' + XMLHttpRequest);  
             },
    timeout: 60000
});

return false;
    }); 
 });

I Delete the scentence with the PDF i think you are right.

I will have a Look in REST API…

is this the right way?

Thx Rob