The JSM Show Post Metadata plugin displays post (ie. posts, pages, and custom post types) meta keys (aka custom field names) and their unserialized values in a metabox at the bottom of the post editing page.
There are no plugin settings – simply install and activate the plugin.
Filter the post meta shown in the metabox:
'jsmspm_metabox_table_metadata' ( array $metadata, $post_obj )
Array of regular expressions to exclude meta keys:
'jsmspm_metabox_table_exclude_keys' ( array $exclude_keys, $post_obj )
Capability required to show post meta:
'jsmspm_show_metabox_capability' ( 'manage_options', $post_obj )
Show post meta for a post type (defaults to true):
'jsmspm_show_metabox_post_type' ( true, $post_type )
Capability required to delete post meta:
'jsmspm_delete_meta_capability' ( 'manage_options', $post_obj )
Icon for the delete post meta button:
'jsmspm_delete_meta_icon_class' ( 'dashicons dashicons-table-row-delete' )