Wordpress Ajax Example

form.js

const url = '/wp-admin/admin-ajax.php'
const data = {
  action: 'custom_action',
  
  token: document.querySelector('[name="token"]').value,
  name: document.querySelector('[name="name"]').value
}

customRequest(url, data) // ...

form.php

<form data-example="...">
  <input type="hidden" name="token" value="<?php echo wp_create_nonce('action-name') ?>">
  <input type="text" name="name" required />
</form>

functions.php

<?php

add_action('wp_ajax_custom_action', 'custom_handle_function');
add_action('wp_ajax_nopriv_custom_action', 'custom_handle_function');

function custom_handle_function() {
  check_ajax_referer('action-name', 'token');
  
  // do stuff

  wp_die();
}