scribu

Custom fields are great for storing various meta data about a post. However, if you routinely need to display posts that have a certain custom field value, you should consider switching to a <a href="https://codex.wordpress.org/Custom_Taxonomies" rel="nofollow ugc">custom taxonomy</a>, which is better suited for grouping posts.
With this simple plugin, you can convert all custom fields with a certain key to terms in a certain taxonomy, while maintaining the post association.
Note: If you’re looking for the old version, see <a href="https://wordpress.org/extend/plugins/custom-query-fields/" rel="ugc">Custom Query Fields</a>
Links: <a href="http://scribu.net/wordpress/custom-field-taxonomies" rel="nofollow ugc">Plugin News</a> | <a href="http://scribu.net" rel="nofollow ugc">Author’s Site</a>

Custom Field Taxonomies

Convert custom fields to tags, categories or taxonomy terms

JS Morisset

The JSM Show User Metadata plugin displays user profile meta keys and unserialized values in a metabox at the bottom of the user profile editing page.
There are no plugin settings – simply install and activate the plugin.
<h4>Available Filters for Developers</h4>
Filter the user meta shown in the metabox:
<pre><code>'jsmsum_metabox_table_metadata' ( array $metadata, $user_obj )
</code></pre>
Array of regular expressions to exclude meta keys:
<pre><code>'jsmsum_metabox_table_exclude_keys' ( array $exclude_keys, $user_obj )
</code></pre>
Capability required to show user meta:
<pre><code>'jsmsum_show_metabox_capability' ( 'manage_options', $user_obj )
</code></pre>
Show user meta for a screen base (defaults to true):
<pre><code>'jsmsum_show_metabox_screen_base' ( true, $screen_base )
</code></pre>
Capability required to delete user meta:
<pre><code>'jsmsum_delete_meta_capability' ( 'manage_options', $user_obj )
</code></pre>
Icon for the delete user meta button:
<pre><code>'jsmsum_delete_meta_icon_class' ( 'dashicons dashicons-table-row-delete' )
</code></pre>
<h4>Related Plugins</h4>
<ul>
<li><a href="https://wordpress.org/plugins/jsm-show-comment-meta/" rel="ugc">JSM Show Comment Metadata</a></li>
<li><a href="https://wordpress.org/plugins/jsm-show-order-meta/" rel="ugc">JSM Show Order Metadata for WooCommerce HPOS</a></li>
<li><a href="https://wordpress.org/plugins/jsm-show-post-meta/" rel="ugc">JSM Show Post Metadata</a></li>
<li><a href="https://wordpress.org/plugins/jsm-show-term-meta/" rel="ugc">JSM Show Term Metadata</a></li>
<li><a href="https://wordpress.org/plugins/jsm-show-user-meta/" rel="ugc">JSM Show User Metadata</a></li>
<li><a href="https://wordpress.org/plugins/jsm-show-registered-shortcodes/" rel="ugc">JSM Show Registered Shortcodes</a></li>
</ul>

JSM Show User Metadata

throws now errors/warnings, good performance, just fulfills it's job. 5 stars

just works

Show user metadata in a metabox when editing users - a great tool for debugging issues with user metadata.

Custom Field Taxonomies vs JSM Show User Metadata