title: Error: listen EADDRINUSE: address already in use :::3000 trying to run server in node js
body: <p>I have write code for connection</p>
  <pre><code>const mongoose = require('mongoose');
  
  mongoose.connect(process.env.MONGO_URI, {
      useNewUrlParser: true,
      useUnifiedTopology: true,
      useCreateIndex: true,
      useFindAndModify: true
  }).then(() =&gt; {
      console.log('Connection successfull!');
  }).catch((e) =&gt; {
      console.log('Connection failed!');
  })
  </code></pre>
  <p>after run server occurred this error</p>
  <pre><code>Error: listen EADDRINUSE: address already in use :::3000
  </code></pre>