How to implement captcha using JWT tokens?

Question

JavaScript

JWT cannot store sensitive data as it is easy to decrypt. How to store captcha data in this case? Or, for example, how to implement a rate limit bound to a token and ip?

Answer 1

Like this: https://jsfiddle.net/IonDen/55665p35/

function prettify (num) {
    var n = num.toString();
    var separator = " ";
    return n.replace(/(\d{1,3}(?=(?:\d\d\d)+(?!\d)))/g, "$1" + separator);
}

var $test = $(".test");
var val = $test.prop("value");
$test.prop("value", prettify(val));

Answer 2

Another option.
Formats blur.
When changed, spaces are removed and can be adjusted.
thanks to Denis Ineshin for the regular expression.
codepen.io/alexanderkshnyakin/pen/NNorZz

Answer 3

const numb = 1234567;
const numbFmt = new Intl.NumberFormat('ru-RU').format(numb);
console.log('Отформатированное число: ' + numbFmt); // 1 234 567

const numb = 1234567;
const numbFmt = numb.toLocaleString('ru-RU');
console.log('Отформатированное число: ' + numbFmt);  // 1 234 567

Answer 4

The previous methods don't work well for very large numbers, so here's mine:

console.log(
"498065392975507667366026341067548906436328316841307936116457316164193184705285250962660148627300967657213217328759941177315742017903027130095729437206958025287403606910196074469378649164695055964366281024547871829070617652494336"
  .split("")
  .reverse()
  .join("")
  .replace(/\d\d\d/g, "$& ")
  .split("")
  .reverse()
  .join("")
);

Answer 5

On server