title: Javascript Check if the Date is already Expired in Token
body: <p>Good day, </p>
  
  <p>I'm using jwt in my authentication. I already decoded my token but the problem is, I want to check if the token <code>exp</code> is already expired or not. </p>
  
  <pre><code>var decodedToken = localStorage.getItem('user_token');
  
  console.log(decodedToken.exp) // writes 1540360205
  </code></pre>
  
  <p>Thank you in advance.</p>