When used Sub and Aud Claim of payload on a system with JSON Web Token
<p>I'm conducting tests to understand and implement a system of user authorization through the use of JSON Web Token.</p>

<p>Looking for information about the configuration of a token arises me a couple of questions about the use of two Claim Payload, the Sub and Aud.</p>

<pre><code>{
    "iss": "www.miweb.com", // issuer
    "iat": 1455550200, // time was issued
    "exp": 1455559810, // expiration timestamp
    "nbf": 1455550260, // not before
    "jti": "31d6cfe0d16ae931b73c59d7e0c089c0", // unique identifier

    "sub": "", // ¿subject?
    "aud": "", // ¿?

    "data": {/* attached data */}
}
</code></pre>

<p>From what I've observed is rarely used these two claim. My question then is:</p>

<p><strong>What scenario can give use and for what purpose?</strong></p>

<p>Thank you very much, greetings</p>

<p>Same written in Spanish StackOverflow question: <a href="https://es.stackoverflow.com/q/11786/5984">https://es.stackoverflow.com/q/11786/5984</a></p>

<p>Ps: Sorry for the language, not domain.</p>

<p><em>Edited: Translation of comments in the code</em></p>