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Debug This

Peek under the hood with sixty debugging reports just one click away.

For admins, developers, and support staff, Debug This provides a ton of information about your WordPress installation, all from the front-end admin bar.

  • The current WP_Query object
  • Blog info and options
  • Embed providers
  • Files in rendered HTML (CSS, images, JavaScript)
  • Filters and actions
  • Images sizes
  • Globals and constants
  • Menus
  • Object cache stats
  • Plugins, must-use plugins, and dropins
  • Rewrite rules
  • Queries
  • PHP and server information
  • Post attachments
  • Post types
  • Scripts and styles enqueued
  • Shortcodes
  • Sidebars and widgets
  • Taxonomies and terms
  • Themes
  • Users
  • WP cron schedules and jobs
  • WP debug log

Debug This helps you save time and effort when trying to figure out what's going on. Instead of hardcoding debug snippets or writing complex unit tests for small functionality, you can simply bring to the surface what you need right from the admin bar.

For example, when viewing a single post, you can see:

  • a list of post attachments,
  • which menus and sidebars are being displayed,
  • the post type, post fields, and meta data,
  • the current query variables and query string,
  • the rewrite rules applied,
  • the author,
  • the terms,
  • and much more.

If there's no debug mode that addresses your need, create one with the Debug This API. To extend Debug This for your own needs, please see the Extend section.

Now compatible with Kint!

Don't get lost in deep arrays and objects. Organize and isolate your debugging output by installing this great plugin: Kint Debugger

Recommended Plugins

Author Brian Fegter, Chris Dillon
Contributors misternifty, cdillon27
Tags debug, debugger, developer, filters, hooks, objects, print_r, queries, query, scripts, styles, var_dump
  1. debug-this screenshot 1

    The current query, for example.

  2. debug-this screenshot 2

    Enhanced display when a Kint debugger plugin is installed (see Description).

  1. Upload to your plugins folder, usually wp-content/plugins/
  2. Activate the plugin on the plugin screen.
  3. Navigate to the front-end of your website and hover over the 'Debug This' menu item in the admin bar.

0.5.1 - December 27, 2016

  • Prevent conflict with Kint Debugger when Debug Bar is active.

0.5 - December 15, 2016

  • Update for WordPress 4.4+
  • Add error handling.
  • Add mode for unserialized options.
  • Add mode for active plugins.
  • Add <pre> tags conditionally (not every mode).
  • Compatible with Kint wrapper plugins.
  • Compatible with custom error logs.
  • Remove Bootstrap stylesheet.
  • Update POT file.

0.4 - August 29, 2015

  • Fix display of global array variables.
  • Fix display of current template.
  • Fix use of a deprecated function.

0.3.2 - April 17, 2015

  • Improve SAVEQUERIES check.

0.3.1 - March 17, 2015


  • Added advanced remote fetch for buffer
  • Added real saved queries and execution time from original URL - can now be accessed as static properties $queries and $execution_time
  • Added get_current_debug_url() method - exposes current URL with debug query
  • Added post-meta debug mode. Created new menu section for queried object
  • Updated bloginfo mode to true bloginfo values
  • Updated wp-debug mode with better logic
  • Added functionality for adding header links to the debug mode screen via add_debug_header_link($url, $label, $classes = '')
  • Added reset debug log functionality with debug header link for wp-debug mode


  • Added backwards compatibility to 3.3.
  • Added support for no pretty permalinks.


  • Critical fix for PHP <= 5.2 Removed anonymous functions.
  • Fixed undefined $debug notices for all versions.


  • Added new debug modes: Apache modules, PHP loaded extensions, file permissions, php.ini, $_SERVER, and execution time.
  • Added three functions for getting file ownership and permissions
    • debug_this_get_file_ownership($file)
    • debug_this_get_file_perms($file)
    • debug_this_convert_perms_to_rwx($perms)


  • Debug This Creation

How do I use Debug This?

  1. Make sure the admin bar is enabled in your user profile.
  2. Visit any page/post/archive on your website and you will see a Debug This menu item on the admin bar.

What PHP version is this compatible with?

We've tested on PHP >= 5.2.17

Can I request new debug modes?

Certainly! In order to keep the plugin lightweight and performant, requests that are too localized for the greater good may be refused. If that happens, I will gladly help you build your own debug mode.

Can I alter the plugin or build my own debug modes?

Yes! Visit the Extend section to find out how you can thoroughly extend Debug This for your own needs.


Debug This Functions

New debug modes can be created easily:

    $group = 'General'


    __('Actions', 'debug-this'),
    __('$wp_actions contains all active registered actions', 'debug-this'),
    'Filters And Actions'
function foo_callback($buffer, $template){
    global $wp_actions;
    $debug = print_r($wp_actions, true);
    return $debug;

You can add links to the header of a debug mode page. Place this code within your debug callback function.

add_debug_header_link('http://urltolink', 'Link Label');

Extensions can be removed as well using remove_debug_extension($mode);

No PRE Tags

If you don't want your debug output to be enclosed in PRE tags, simply set the following in your extension:

Debug_This::$no_pre = true;

Saved Queries and Execution Time

Retrieve saved queries and execution time by using the following static properties:

  • Debug_This::$execution_time
  • Debug_This::$queries - SAVEQUERIES must defined as true

URL Helpers

  • Debug_This::get_current_debug_url() - current URL with the debug query
  • Debug_This::get_escape_url() - used for the debug escape link that links to original page URL

WP Actions

  • debug_this - receives the $mode arg - outputs the debug code sent from the extension modes. The default action is set to priority 5. This allows you to prepend or append any output without conflict using less or greater priorities.

WP Filters

There are a few filters you can use to customize Debug This to your needs:

  • debug_this_template - receives $template arg - Use your own template
  • debug_this_default_mode - receives $mode arg - Alters the mode for the parent DT admin bar button link.
  • debug_this_output - receives $output, $mode args - Filter debug content before it's rendered


To access the built-in Debug This JS functionality, enqueue your custom script with the dependency set to debug-this. Your script will inherit a jQuery dependency.

Object: debugThis

  • debugThis.mode - current mode
  • debugThis.defaultMode
  • debugThis.template - current included template
  • debugThis.queryVar - the defined query string variable


  • isDebug()
  • getDebugMode() - uses isDebug()


A jQuery debug-this event is fired from the footer. You can hook into this event with the following;

jQuery(document).bind('debug-this', function(event, debugThis){

Helper Functions

There are three included functions to help you work with files.

  • debug_this_get_file_ownership($file) - returns array('name' => $name, 'group' => $group)
  • debug_this_get_file_perms($file) - returns string - Example: 0775
  • debug_this_convert_perms_to_rwx($perms) - returns string - converts permission number to RWX format - Example: 0755 folder becomes drwxr-xr-x
Version 0.5.1

Requires WordPress version: 3.3 or higher

Compatible up to: 4.7.2

Last Updated 27 Dec 2016

Date Added: 27 Dec 2012

Plugin Homepage


4.7 stars
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