<p dir="auto">First I want to apologize if I've done anything wrong with this bug report, I'm still new to development and any mistakes made are unintentional.</p>



<p dir="auto">Environment:</p>
<ul dir="auto">
<li>Python version: 3.11.3</li>
<li>Flask version: 2.3.0</li>
</ul>
<p dir="auto"><a href="https://github.com/pallets/flask/blob/c5900a1adf8e868eca745225f3cf32218cdbbb23/flask/json.py#L23">This code</a> is always import error.<br>
(<code class="notranslate">simplejson</code> is not included in the <code class="notranslate">itsdangerous</code>.)<br>
See: <a href="https://github.com/pallets/itsdangerous/blob/master/itsdangerous.py">https://github.com/pallets/itsdangerous/blob/master/itsdangerous.py</a></p>