Reveal hidden form fields
Shows the names and values of hidden fields where pages often stash tracking data.
Code to copy
(function () {
document.querySelectorAll('input[type="hidden"]').forEach(function (inp) {
var box = document.createElement('div');
box.style.cssText = 'background:#fff3cd;border:1px solid #ffc107;' +
'padding:4px 8px;margin:2px 0;font:12px monospace;color:#664d03';
box.textContent = 'hidden field: ' + (inp.name || '(no name)') +
' = ' + (inp.value || '');
if (inp.parentNode) inp.parentNode.insertBefore(box, inp);
});
})();How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
Rate this example
No ratings yet — be the first.