Automattic

Daniel Bachhuber

A quick and easy way to see post meta associated with any given post. When activated, this plugin prints your post meta keys and values inside of a post meta box.
Originally developed for <a href="http://vip.wordpress.com/" rel="nofollow ugc">WordPress.com VIP</a>-hosted clients, we thought it would be useful for development environments, etc. too. Feel free to <a href="https://github.com/Automattic/Post-Meta-Inspector" rel="nofollow ugc">fork the plugin in Github</a> and pull requests are always welcome. Hit us with feedback, questions, bug reports, and feature requests in the forums.

Post Meta Inspector

Lovely little tool. Saves having to go into the database and look through the postmeta table when debugging. Thanks!

Really useful

Yong

Javier Esteban

This plugin is useful if you want to see all post metas that stored in a post or page and the value of each meta. 
Whether for debugging, quick view a data or just curious what is saved inside your post or page meta.
Just install and activate, Post Meta Viewer plugin will show a metabox contain the list table of all post metas that saved for each post or page in easily readable format.
No settings needed just plug and play.
<h4>Thanks to Contributors</h4>
Thank you for the contibution to this plugin to
<ul>
<li><a href="https://profiles.wordpress.org/nobnob/" rel="nofollow ugc">Javier Esteban</a> for translating this plugin to Spanish</li>
</ul>

Post Meta Viewer

View all post meta that saved in a post, page or custom post type in easily readable format. No settings needed just plug and play.

Post Meta Inspector vs Post Meta Viewer