This WordPress snippet will allow you to show the image caption for the featured image in your WordPress posts without using a plugin.
Instructions
Add this code to your theme files (ie. single.php) where you are displaying the image.
<?php if (get_post( get_post_thumbnail_id())->post_content); // check if image has caption added // ?>
<div class="featured_image_caption">
<?php echo wp_kses_post(get_post( get_post_thumbnail_id() )->post_content ); // outputs image caption // ?>
</div>
<?php endif; ?>*you can replace post_excerpt with post_content to get the image description etc.
Sometimes this doesn’t always work. One can use WordPress’ built-in caption-getting function, called `get_the_post_thumbnail_caption()` instead, like so: