Manipulating JSON Web Tokens (JWTs)

I’ve been writing a couple of web services lately that use Auth0 for identity management. It’s a great platform that makes working with different identity providers a breeze. One thing that I couldn’t work out how to do at first was to quickly build a new JWT1 from an existing token. I wanted to take my current token, add some more data to it and return it to the user. So here’s a ‘why’ and ‘how’.
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