user51629: In this file
https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md

Before running, it's recommended you create an RPC configuration file.

Why?

user208: I believe this suggestion is dates from before cookie authentication existed, and is not needed anymore.
Before, it was impossible to use the RPC protocol to send commands to a running bitcoind/bitcoin-qt instance if no username and password were configured.
Since the introduction of cookie authentication, this is no longer needed.

51629: <p>In this file</p>

<p><a href="https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md" rel="nofollow noreferrer">https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md</a></p>

<blockquote>
  <p>Before running, it's recommended you create an RPC configuration file.</p>
</blockquote>

<p>Why?</p>
 208: <p>I believe this suggestion is dates from before cookie authentication existed, and is not needed anymore.</p>

<p>Before, it was impossible to use the RPC protocol to send commands to a running bitcoind/bitcoin-qt instance if no username and password were configured.</p>

<p>Since the introduction of cookie authentication, this is no longer needed.</p>
