title: Is it secure way to store private values in .env file?
body: <p>I'm trying to build a node.js server with express framework, and I want to store a private key for admin APIs in my server.<br/>I'm now using .env file to store those values, and in my routes, using that values by calling like <code>process.env.ADMIN_KEY</code>. </p>
  
  <p><strong>Question</strong><br/>
  Is it secure way to handle private datas? or there's another way better than this?</p>