Query Monitor
Query Monitor is the developer tools panel for WordPress and WooCommerce. It enables debugging of database queries, PHP errors, hooks and actions, block editor blocks, enqueued scripts and stylesheets, HTTP API calls, and more. It includes some advanced features such as debugging of Ajax calls, REST
About this tool.
Query Monitor is the developer tools panel for WordPress and WooCommerce. It enables debugging of database queries, PHP errors, hooks and actions, block editor blocks, enqueued scripts and stylesheets, HTTP API calls, and more.
It includes some advanced features such as debugging of Ajax calls, REST API calls, user capability checks, and full support for block themes and full site editing. It includes the ability to narrow down much of its output by plugin or theme, allowing you to quickly determine poorly performing plugins, themes, or functions.
Query Monitor focuses heavily on presenting its information in a useful manner, for example by showing aggregate database queries grouped by the plugins, themes, or functions that are responsible for them. It adds an admin toolbar menu showing an overview of the current page, with complete debugging information shown in panels once you select a menu item.
Query Monitor supports versions of WordPress up to three years old, and PHP version 7.4 or higher.
For complete information, please see the Query Monitor website .
Here’s an overview of what’s shown for each page load:
- Database queries, including notifications for slow, duplicate, or erroneous queries. Allows filtering by query type ( SELECT , UPDATE , DELETE , etc), responsible component (plugin, theme, WordPress core), and calling function, and provides separate aggregate views for each.
- The template filename, the complete template hierarchy, and names of all template parts that were loaded or not loaded (for block themes and classic themes).
- PHP errors presented nicely along with their responsible component and call stack, and a visible warning in the admin toolbar.
- Usage of “Doing it Wrong” or “Deprecated” functionality in the code on your site.
- Blocks and associated properties within post content and within full site editing (FSE).
- Matched rewrite rules, associated query strings, and query vars.
- Enqueued scripts and stylesheets, along with their dependencies, dependents, and alerts for broken dependencies.
- Language settings and loaded translation files (MO files and JSON files) for each text domain.
- HTTP API requests, with response code, responsible component, and time taken, with alerts for failed or erroneous requests.
