title: Setting Environment Variables for Node to retrieve
body: <p>I'm trying to follow a tutorial and it says:</p>
  
  <blockquote>
    <p>There are a few ways to load credentials.</p>
    
    <ol>
    <li>Loaded from environment variables,</li>
    <li>Loaded from a JSON file on disk,</li>
    </ol>
    
    <p>The keys need to be as follows:</p>
  
  <pre><code>USER_ID, USER_KEY
  </code></pre>
    
    <p>...This means that if you properly set your environment variables, you
    do not need to manage credentials in your application at all.</p>
  </blockquote>
  
  <p>Based on some Googling, it appears that I need to set the variables in <code>process.env</code>?  How and where do I set these credentials?  Example Please.  </p>