title: Always getting invalid signature in jwt.io
body: <p>I always get invalid signature when I input the generated token in jwt.io
  Here is my code for making the token</p>
  
  <pre><code>const secret = 'secret';
  const token = jwt.sign({
      username: user.username,
      userID: user._id
    },
    secret, {
      expiresIn: "1hr"
    }
  );
  </code></pre>
  
  <p>What did I do wrong?</p>
  
  <p>I'm using the jsonwebtoken package. <a href="https://github.com/auth0/node-jsonwebtoken" rel="noreferrer">https://github.com/auth0/node-jsonwebtoken</a></p>