title: How to run custom config file in node.js project
body: <p>In a node.js project using express framework, usually config folder has 3 files:  </p>
  
  <ul>
  <li><code>config.json</code> - runs in prod env</li>
  <li><code>development.json</code> - runs in dev env</li>
  <li><code>staging.json</code> - runs in stage env  </li>
  </ul>
  
  <p>I want to create another config file called <code>example.json</code> and run local dev environment using <code>example.json</code> instead of <code>development.json</code> when ever the code is run with a special environment variable <code>process.env.LOCAL_PROD</code>. </p>
  
  <p>Is there a way to do this? </p>