Significance of port 3000 in Express apps : <p>I noticed that almost all examples of Express.js applications use port 3000 as the default listening port for HTTP servers. Is this just because it's a rarely used port, or is there any other reason for this port number?</p>

<p>If I want to run multiple apps side-by-side on my local machine, is it good practice to use ports like 3000, 3001, 3002, etc.?</p>

<p>(I understand that ideally, you'd let the system assign ports. This is just a question as a matter of simplicity, and why 3000 seems to be a conventional assignment.)</p>
