title: How to check JWT token expiration time without secret?
body: <p>I need to check JWT token before sending it in request. But I not generated this token, I just reseived it by authorization, than, I have no secret for it.</p>
  
  <p>I use <code>io.jsonwebtoken.jjwt</code> library.</p>
  
  <p>How to check token expiration time with this library?</p>