Query Monitor is the developer tools panel for WordPress. It’s a plugin that enables you to inspect and debug many aspects of your site, including:

  • Database queries
  • PHP errors
  • Hooks and actions
  • Enqueued scripts and styles
  • Theme template files
  • Languages and translations
  • Rewrite rules
  • Block editor blocks
  • HTTP API calls
  • and much more…

Query Monitor focuses on presenting information in a useful manner, for example by showing database queries grouped by the plugins, themes, or functions that are responsible for them. This allows you to efficiently determine which plugins, themes, or functions are performing poorly.

Query Monitor is free and open source software, just like WordPress.