title: How to automatically reload Node.js project when using pm2
body: <p>I am currently programming Node.js with Express.js, and every time I change a line of code in the file router or app, I need to type the command: </p>
  
  <pre><code>pm2 reload id_project.
  </code></pre>
  
  <p>How do I make pm2 auto-reload the project when a file is changed? </p>