If you’ve been working with WordPress for a while, you know that things don’t always go as planned. Maybe a plugin suddenly stops working, or your website loads at a snail’s pace. Debugging and testing are crucial for keeping your site running smoothly. Luckily, some fantastic WordPress plugins can help you troubleshoot and fix issues with ease.
In this post, we’ll go over the 10 best WordPress debugging and testing plugins, discussing their features, pros and cons, and pricing, all in a beginner-friendly way.
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1. Query Monitor
Query Monitor is a must-have plugin for developers and advanced users looking to debug and optimize WordPress websites. It provides real-time insights into database queries, PHP errors, script execution, and other performance-related metrics. Whether you’re troubleshooting a slow website, identifying problematic plugins, or analyzing database queries, Query Monitor offers an in-depth look at your site’s backend processes.
Features of Query Monitor
Debug Database Queries
Query Monitor allows you to inspect all database queries running on your WordPress site. It helps identify slow or duplicate queries that could be affecting site performance. You can filter queries by component (plugins, themes, core) to pinpoint inefficiencies easily.
Track PHP Errors and Warnings
The plugin logs PHP errors, warnings, and notices, making it easier to troubleshoot code-related issues. Developers can quickly detect problematic scripts and make necessary fixes to improve stability.
Monitor Hooks and Actions
Query Monitor provides a detailed breakdown of hooks and actions running on your site. This is particularly useful for developers who need to analyze custom functionalities added via themes and plugins.
Analyze HTTP API Calls
With Query Monitor, you can track external HTTP API requests made by plugins, themes, or WordPress itself. This feature helps identify third-party services slowing down your site.
Memory Usage and Execution Time
The plugin gives insights into your site’s memory usage and script execution time. It helps optimize resource consumption, ensuring better speed and performance.
Multisite Compatibility
Query Monitor fully supports WordPress multisite networks, allowing administrators to debug multiple sites efficiently from a single dashboard.
Pros
- Detailed Insights - Provides comprehensive data on database queries, PHP errors, and scripts.
- Plugin and Theme Conflict Detection - Helps identify compatibility issues between different plugins and themes.
- Free and Open-Source - No cost, actively maintained, and available in the WordPress plugin repository.
Cons
- Not Beginner-Friendly - The extensive data can be overwhelming for users with no technical background.
- Requires Technical Knowledge - Understanding database queries and PHP errors may need some coding experience.
Pricing: Free
2. Debug Bar
Debug Bar is a lightweight WordPress plugin designed to help developers quickly access essential debugging information. By adding a debug menu to the WordPress admin bar, it provides real-time insights into database queries, PHP warnings, and cache statuses. This plugin is particularly useful for developers who need a simple tool to analyze performance issues without complex configurations.
Key Features:
Debug Menu in Admin Bar
Debug Bar integrates directly into the WordPress admin bar, providing easy access to debugging tools without needing to navigate through multiple settings pages. This ensures a smooth workflow for developers.
Database Query Insights
The plugin displays database queries made during page loads, helping developers identify slow or inefficient queries that could be affecting website performance.
PHP Warnings and Notices
Debug Bar captures and displays PHP warnings, notices, and deprecated function usage. This is essential for troubleshooting coding issues and ensuring compatibility with newer PHP versions.
Cache Status Monitoring
The plugin provides insights into WordPress cache usage, allowing developers to determine whether caching mechanisms are working effectively or if adjustments are needed.
Extensible with Add-ons
Debug Bar supports various extensions, such as Debug Bar Console, which enables users to execute PHP and SQL queries directly within WordPress. Other add-ons provide additional debugging functionalities.
Pros:
- Simple and Lightweight - Minimal impact on website performance, making it a great choice for quick debugging.
- Easy Access - Integrates seamlessly into the admin bar for instant debugging insights.
- Extensible - Supports add-ons like Debug Bar Console for added functionality.
Cons:
- Limited Advanced Features - Lacks in-depth performance metrics compared to plugins like Query Monitor.
- Not as Detailed - This does not provide as much granular data on database queries and script execution.
Pricing: Free
Who Should Use It?
Developers looking for a lightweight and accessible debugging tool to monitor database queries, PHP warnings, and cache performance.
3. WP Debugging
WP Debugging is a simple yet powerful WordPress plugin designed to help developers quickly enable debug mode with just one click. It automatically logs PHP errors and warnings, making it easier to troubleshoot performance and server-related issues. This lightweight plugin is ideal for WordPress users who need an efficient way to diagnose site errors without manually editing configuration files.
Key Features:
One-Click Debug Mode Activation
With WP Debugging, you can enable WordPress to debug mode instantly, eliminating the need to modify the wp-config.php file manually. This is especially useful for non-technical users or those who want a hassle-free debugging experience.
Automatic PHP Error Logging
The plugin logs PHP warnings, errors, and notices, helping developers pinpoint coding issues that could be affecting website functionality or performance. This ensures smooth site operation by addressing potential bugs early.
Helpful for Server Performance Testing
WP Debugging helps analyze website performance issues by identifying PHP-related bottlenecks. It is a valuable tool for diagnosing slow load times and troubleshooting unexpected crashes.
Pros:
- Super Easy to Use - No technical knowledge is required to activate debug mode.
- Helps Troubleshoot Server Issues - Identifies PHP errors that may impact performance.
- Lightweight - Does not slow down your website while running in the background.
Cons:
- Limited to PHP Debugging - Does not provide insights into database queries, scripts, or HTTP API calls.
- Lacks a UI for Deeper Analysis - No advanced visualization or performance tracking features.
Pricing: Free
Who Should Use It?
WordPress developers and site owners looking for an easy way to enable debug mode and log PHP errors for troubleshooting website performance issues.
4. Log Deprecated Notices
Log Deprecated Notices is a specialized WordPress plugin designed to help developers identify outdated functions and files within themes and plugins. It ensures compatibility with newer WordPress versions by logging deprecated function calls and suggesting replacements. This tool is essential for maintaining legacy plugins and themes while preparing them for future WordPress updates.
Key Features:
Detects Deprecated Functions and Files:
The plugin scans your WordPress site for outdated functions and files, flagging those that have been deprecated. This helps developers update their code proactively.
Logs Deprecated Function Calls:
Whenever a deprecated function is used, the plugin logs the instance, providing details on the file, line number, and recommended alternative functions.
Ensures Compatibility with New WordPress Versions:
By identifying outdated code, Log Deprecated Notices helps developers future-proof their themes and plugins, ensuring seamless performance with WordPress updates.
Pros:
- Essential for developers to maintain older plugins/themes.
- Helps ensure compatibility with future WordPress updates.
- Simple and effective with minimal setup.
Cons:
- Not useful for non-developers or general users.
- Doesn’t debug other WordPress issues like performance or database queries.
Pricing: Free
Who Should Use It?
WordPress developers manage legacy themes and plugins, ensuring their compatibility with future WordPress updates.
5. WP-CLI Debugging Tool
WP-CLI Debugging Tools offer a command-line interface for diagnosing and troubleshooting WordPress issues efficiently. Designed for developers and advanced users, these tools help identify database problems, check site performance, and automate debugging tasks without relying on a graphical user interface.
Key Features:
Command-Line Debugging:
WP-CLI allows users to run debugging commands directly in the terminal, making it faster and more efficient than traditional debugging methods. It helps diagnose plugin conflicts, database issues, and theme errors.
Database Health and Performance Checks:
Users can inspect the database for inconsistencies, optimize tables, and run maintenance tasks to ensure smooth operation. This is useful for keeping the site’s backend optimized.
Fix Common WordPress Issues:
With WP-CLI, users can troubleshoot missing files, reset plugins, clear caches, and repair databases - all without logging into the WordPress dashboard.
Pros:
- Ideal for developers and advanced users.
- Extremely powerful and flexible.
- Helps automate debugging and maintenance tasks.
Cons:
- No graphical interface, requiring command-line knowledge.
- Not beginner-friendly due to the technical nature of commands.
Pricing: Free
Who Should Use It?
Developers, sysadmins, and advanced WordPress users who prefer command-line efficiency for troubleshooting and maintenance tasks.
Also Read: 10 Best Database Management Plugins
6. New Relic Performance Monitoring
New Relic is a powerful performance monitoring tool designed for enterprise-level WordPress sites. It provides real-time insights into server performance, database queries, and application health, helping website owners and developers detect and fix performance bottlenecks before they affect user experience.
Key Features:
Website Speed & Performance Monitoring:
New Relic tracks website speed, server response times, and database performance, providing detailed insights to help optimize loading times and overall site efficiency.
Slow Query & Bottleneck Detection:
Identifies slow database queries and server bottlenecks that might be causing performance issues, making it easier to optimize database interactions and enhance site performance.
Real-Time Insights & Alerts:
Offers real-time monitoring with instant alerts when performance issues arise, allowing developers to respond quickly to prevent downtime or slow site speeds.
Integration with Other Monitoring Tools:
New Relic seamlessly integrates with various hosting environments and other monitoring tools, offering a comprehensive view of website performance across different levels.
Pros:
- Enterprise-level debugging and performance monitoring.
- Helps optimize website speed with real-time tracking.
- Works seamlessly with other monitoring tools and hosting services.
Cons:
- Can be expensive for small websites.
- Requires some setup and technical knowledge to utilize fully.
Pricing:
Paid (Starts at $99/month for advanced features)
Who Should Use It?
Businesses and developers managing high-traffic WordPress websites need in-depth performance monitoring and optimization.
7. Error Log Monitor
Error Log Monitor is a simple yet effective WordPress plugin designed to track PHP errors and log them directly in the WordPress dashboard. Keeping error logs in one place, allows developers and site owners to identify recurring issues quickly and take proactive steps to fix them. This lightweight tool is particularly useful for troubleshooting WordPress sites without needing to access server logs manually.
Key Features:
Tracks PHP Errors & Logs in Dashboard:
Automatically records PHP errors and warnings in a user-friendly format within the WordPress admin panel, making it easy to spot and address potential issues.
Helps Identify Recurring Issues:
The plugin provides a structured log of errors, enabling users to track persistent problems and debug their site effectively.
Sends Error Notifications:
Get email notifications for new errors, ensuring that site administrators are immediately alerted to critical issues before they impact website functionality.
Pros:
- Easy to set up and use with minimal configuration.
- Keeps all PHP error logs in one accessible location.
- Helps in proactive debugging and troubleshooting.
Cons:
- Does not provide advanced performance tracking.
- Limited to PHP error monitoring, without database or query debugging.
Pricing: Free
Who Should Use It?
Website owners and developers looking for a simple way to track PHP errors without needing server access.
8. Health Check & Troubleshooting
Health Check & Troubleshooting is an official WordPress.org plugin designed to help users diagnose and resolve common website issues. It simplifies troubleshooting by identifying configuration errors, plugin conflicts, and theme-related problems without affecting site visitors. With its unique ‘troubleshooting mode,’ users can isolate problems safely before making permanent changes, making it an essential tool for both beginners and experienced developers.
Key Features:
Checks for Common Configuration Errors:
The plugin automatically scans your WordPress setup for common configuration issues, such as missing PHP modules, outdated versions, or incorrect server settings. This helps prevent potential website malfunctions.
Troubleshoots Plugin and Theme Conflicts:
By activating ‘troubleshooting mode,’ users can temporarily disable plugins and themes for their session only, allowing them to pinpoint the root cause of issues without affecting site visitors.
Provides a ‘Troubleshooting Mode’ to Isolate Issues:
The troubleshooting mode creates a safe testing environment where users can activate or deactivate plugins one by one to identify conflicts, all without affecting live site performance.
Pros:
- Perfect for diagnosing plugin and theme conflicts.
- Easy for beginners to use without technical knowledge.
- Officially maintained by WordPress.org, ensuring reliability.
Cons:
- Does not provide detailed logs for advanced debugging.
- Lacks performance monitoring and in-depth error tracking.
Pricing: Free
Who Should Use It?
Site owners, developers, and support teams looking to troubleshoot website issues safely without breaking the live site.
9. MonsterInsights Debug Mode
MonsterInsights Debug Mode is a troubleshooting tool designed for users who want to ensure their Google Analytics tracking is set up correctly on their WordPress website. As part of the MonsterInsights plugin, this feature helps marketers, website owners, and SEO professionals diagnose tracking issues, verify real-time activity, and ensure data accuracy for better decision-making.
Key Features:
Debugs Google Analytics Setup:
The tool checks for misconfigurations in Google Analytics integration, helping users identify and fix errors that may prevent proper data tracking.
Helps Fix Tracking Issues:
It ensures that events, page views, and conversions are being recorded correctly, allowing users to troubleshoot tracking problems effectively.
Shows Real-Time Tracking Activity:
Users can view live analytics data within WordPress, confirming that website traffic and interactions are being logged as expected.
Pros:
- Great for marketers and SEO experts who rely on accurate data.
- Ensures proper Google Analytics tracking without requiring manual debugging.
- User-friendly interface integrated within WordPress.
Cons:
- Only useful for Google Analytics debugging, not general WordPress issues.
- Requires the MonsterInsights Pro version to access.
Pricing: Paid (Part of MonsterInsights Pro, starting at $99.50/year)
Who Should Use It?
Marketers, website owners, and SEO professionals who need to troubleshoot and verify their Google Analytics tracking setup.
10. WP Crontrol
WP Crontrol is a powerful WordPress plugin that allows users to debug, manage, and modify cron jobs directly from the WordPress dashboard. Cron jobs are scheduled tasks that help automate various website functions, such as publishing scheduled posts, running maintenance tasks, and updating plugins. This plugin is essential for developers and website owners who want better control over WordPress’s built-in scheduling system.
Key Features:
Debugs and Manages WordPress Cron Jobs:
WP Crontrol provides an interface to view and manage all scheduled tasks running in WordPress, making it easier to troubleshoot issues related to missed or failed cron jobs.
Helps Fix Scheduled Task Issues:
If scheduled posts or automated tasks are not running as expected, the plugin helps identify and fix these problems, ensuring WordPress functions smoothly.
Allows Manual Execution of Cron Jobs:
Users can manually run scheduled tasks to test their execution, which is particularly useful for debugging issues related to automated processes.
Pros:
- Perfect for fixing missed scheduled posts and automating background tasks.
- Useful for debugging issues related to WordPress’s cron system.
- Free, lightweight, and easy to use.
Cons:
- Limited to cron job management and debugging.
- Requires some knowledge of WordPress cron functionality for advanced usage.
Pricing: Free
Who Should Use It?
Developers and website owners who need better control over scheduled tasks and automation in WordPress.
Fix Issues Faster: Choose the Best Debugging Plugin for You
Debugging and testing your WordPress site doesn’t have to be a nightmare. With the right tools, you can quickly diagnose issues, improve site performance, and keep everything running smoothly. If you’re a beginner, Health Check & Troubleshooting is a great starting point. For developers, Query Monitor and WP-CLI Debugging Tools offer powerful insights. Need performance monitoring? New Relic is your best bet.