Getting, 'throw typeError(MSG_INVALID_SECRET);' when i run node sever
<p>I forked from a repo of an applications for the purpose of learning about user authentication.  I get this error 'throw typeError(MSG_INVALID_SECRET)' when I run $node server while trying to login .  I am assuming it has something to do with the fact that in controllers/usersController.js I have:</p>

<blockquote>
  <p>const jwt = require('jsonwebtoken'); const secret =
  process.env.SECRET;</p>
</blockquote>

<p>Clearly I need something like process.env in my root directory...I think.  How do I make such a file, what should be in it?  What is the purpose of this file?</p>

<p>Thanks.</p>