@skhemata/skhemata-form/src/validator/lib/isJWT.js

Skhemata Form Web Component. This web component can be used as base web component when working with forms and inputs.

import assertString from './util/assertString';
import isBase64 from './isBase64';

export default function isJWT(str) {
  assertString(str);

  const dotSplit = str.split('.');
  const len = dotSplit.length;

  if (len > 3 || len < 2) {
    return false;
  }

  return dotSplit.reduce((acc, currElem) => acc && isBase64(currElem, { urlSafe: true }), true);
}