title: One user changes can reflect to other users in same time using nodejs
body: <p>I have a <code>react js</code>, <code>node js</code> and <code>mongoDB</code> application. I have a collection in mongoDB.</p>
  
  <p><strong>Senario :</strong> Let's say there are 3 users (<strong>A, B, C</strong>) login in same time. All of them are accessing same collection <strong>in same time</strong>. Let C changed something in the collection from UI. </p>
  
  <ol>
  <li>So how A and B can access those changes done by C in UI in same time ?</li>
  <li>And in this senario what should be the best approach ?</li>
  </ol>