Unmasking Errors: A Step-by-Step Guide to Viewing WordPress Logs

Why WordPress Error Logs Are Critical for Your Website’s Health

When your WordPress site displays the infamous “white screen of death,” throws a “There has been a critical error on your website” message, or simply stops working as expected, the frustration is real. Your first instinct might be to start frantically deactivating plugins and themes, a time-consuming process of trial and error. Instead of guessing, you can view WordPress error logs to find the root cause with surgical precision. These logs are detailed, chronological records of every error, warning, and notice your website generates behind the scenes.

Think of it as the difference between a doctor guessing your ailment versus reading an MRI scan. The error log provides a clear diagnosis. Here’s the quick process for leveraging this powerful tool:

Enable debug mode: This is done by adding a few lines of code to your wp-config.php file or by using a dedicated plugin.
Replicate the error: Intentionally perform the action that causes the issue to ensure a fresh, time-stamped entry is created in the log.
Find the log file: Navigate to the /wp-content/ directory on your server to find the debug.log file.
Download and analyze: Open the file and examine the error messages to identify the problematic plugin, theme, or code.
Disable logging: Once the issue is resolved, turn off debug mode to restore site performance and secure your site.

By default, WordPress keeps error logging turned off. This is a sensible default for live websites, as constant logging can consume server resources and, if configured incorrectly, expose sensitive information. However, for troubleshooting, these logs are invaluable. They provide the exact file path, line number, and a clear error description, giving you everything needed to fix problems fast.

I’m Kevin Gallagher, and in my fifteen years running wpOncall, I’ve used error logs to diagnose complex issues on over 2,500 WordPress sites. I’ve seen firsthand how learning to view WordPress error logs systematically transforms a site owner from guessing at solutions to confidently solving any problem that comes their way.

Basic view wordpress error logs vocab:

Understanding WordPress Error Logs: Your First Line of Defense

Think of WordPress error logs as your website’s private detective. When something goes wrong—a plugin update causes a crash, a theme function fails, or data fails to save—these logs meticulously document what happened, when it happened, and where the problem originated. When you view WordPress error logs, you’re not just looking at cryptic code; you’re reading a diary of everything that went sideways, giving you the clues needed to solve the case.

Surprisingly, a default WordPress installation has error logging turned off. This isn’t an oversight; it’s a deliberate choice to maximize performance and security on a live site. Constantly writing logs consumes server resources (CPU and disk I/O), and displaying errors publicly can reveal server paths and code vulnerabilities to malicious actors. However, when your site breaks, crashes, or shows the white screen of death, the temporary performance cost of enabling logs becomes negligible compared to the benefit of rapid troubleshooting.

Error logs cut through the confusion and show you exactly what’s broken, saving you from the frustrating guesswork of deactivating plugins one by one.

Plugin Conflicts: Imagine you install a new shipping calculator plugin, and suddenly your checkout page crashes. Instead of blaming the new plugin, the old one, or WooCommerce itself, the error log might point to a fatal error caused by both plugins trying to declare a function with the same name. This allows you to target the troublemaker immediately.
Theme Errors: You update to the latest version of WordPress, and parts of your site’s layout appear broken. A poorly coded theme might be using a deprecated function that was removed in the new core update. The logs will highlight this, pointing to the exact file and line in your theme that needs updating, often preventing a complete site redesign.
PHP Errors: Since WordPress is built on PHP, the logs are filled with valuable PHP error messages. An upgrade to your server’s PHP version could expose outdated code in a plugin that was previously working fine. The logs will capture PHP notices, warnings, and fatal errors, including the specific file and line number where the incompatibility occurred. This is crucial for developers and savvy site owners to pinpoint the source of the problem.

Every log entry contains a treasure trove of information that turns vague problems into actionable, fixable issues:

Timestamp: [DD-Mon-YYYY HH:MM:SS UTC] tells you exactly when the error happened. This is vital for correlating the issue with recent actions, like a plugin update or a content change.
Error Description: This provides a clear, human-readable explanation of what went wrong, such as “Undefined variable” (the code tried to use a variable that doesn’t exist) or “Call to undefined function” (the code tried to run a function that hasn’t been defined).
File Path: This shows the absolute server path to the file that caused the error, like /home/user/public_html/wp-content/plugins/problematic-plugin/includes/functions.php. This immediately identifies the source, whether it’s a plugin, theme, or core file.
Line Number: This pinpoints the precise line of code within that file that triggered the error, allowing developers to fix the problem with incredible speed and accuracy.

Understanding the different error types helps you prioritize your response:

Notices: These are the mildest errors. They are suggestions from PHP about code that could be problematic but doesn’t stop the script from running. For example, trying to use a variable that hasn’t been defined yet. They don’t break your site but are good to fix for clean code.
Warnings: These are more serious problems that indicate something is wrong, but they don’t typically halt script execution. An example is trying to include() a file that doesn’t exist. The site usually keeps running, but you may see unexpected behavior or missing elements.
Fatal Errors: These are the most serious type. They immediately stop the script from running and are the primary cause of the “white screen of death” or critical error messages. A fatal error demands immediate attention, as it means a key part of your website is completely broken.

When you view WordPress error logs and spot a fatal error, you’ve likely found the smoking gun behind your site crash. This level of precision transforms troubleshooting from a frustrating, time-consuming guessing game into a targeted, efficient problem-solving process. For comprehensive guidance on resolving these issues once you’ve found them, our Fix WordPress Errors Guide walks you through common solutions.

How to Enable WordPress Error Logging (2 Core Methods)

Before you touch a single file or install a plugin to enable error logging, always create a full backup of your website. Editing core files like wp-config.php can, if done incorrectly, take your entire site offline. A simple typo or syntax error could result in a 500 Internal Server Error. A recent backup is your non-negotiable safety net. If you have access to a staging site, it is the perfect place to test these changes without any risk to your live environment.

There are two primary ways to enable logging. The first method, manual editing, offers complete control and avoids adding another plugin to your site. The second method, using a plugin, provides a user-friendly, code-free alternative for beginners.

Method 1: Manually Editing the `wp-config.php` File

This method gives you direct, granular control over your debugging setup and is the preferred approach for developers. The wp-config.php file, located in your WordPress root directory, acts as the control center for your site’s most critical settings.

Access Your Site’s Files: You’ll need to connect to your server. The most common way is with an FTP (File Transfer Protocol) client like FileZilla, which requires FTP credentials (host, username, password) from your hosting provider. Alternatively, most hosting control panels (like cPanel or Plesk) offer a web-based “File Manager” that lets you browse your server files directly in your browser.
Locate the wp-config.php File: Navigate to your WordPress root directory. This is the main folder containing your WordPress installation, where you’ll see subfolders like wp-admin, wp-content, and wp-includes. The wp-config.php file is located here.
Back It Up (Again): Before editing, right-click the file and download a copy to your computer. This creates an instant backup of this specific file, which you can re-upload if anything goes wrong.
Add the Debug Code: Open wp-config.php for editing. Scroll down until you find the line that says /* That's all, stop editing! Happy blogging. */ or a similar comment. Just above this line, paste the following code snippet:

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );
@ini_set( 'display_errors', 0 );

Here’s a detailed breakdown of what each line does:

define( 'WP_DEBUG', true );: This is the master switch. It turns on WordPress’s debugging mode.
define( 'WP_DEBUG_LOG', true );: This tells WordPress to save all errors to a log file named debug.log inside the /wp-content/ folder.
define( 'WP_DEBUG_DISPLAY', false );: This is a crucial security measure. It prevents errors from being displayed on the front end of your website, where visitors and potential attackers could see them.
@ini_set( 'display_errors', 0 );: This is an additional safeguard that attempts to override the server’s default setting to ensure errors are not displayed on screen, complementing the line above.

If you already see a line define( 'WP_DEBUG', false );, simply change false to true and add the other three lines below it. Save the file and, if using FTP, upload it back to the server, overwriting the existing file. For more details, you can always consult WordPress’s official documentation on editing wp-config.php.

Method 2: Using a WordPress Plugin for Debugging

If you’re not comfortable editing code or accessing server files, a plugin is an excellent and safe alternative to view WordPress error logs. These plugins work by programmatically enabling the same debug settings in wp-config.php for you, providing a simple toggle switch within your dashboard.

Find a Suitable Plugin: From your WordPress admin dashboard, navigate to Plugins > Add New. Use the search bar to look for terms like “WP Debugging” or “debug log.”
Install and Activate: Choose a well-regarded and recently updated plugin like “WP Debugging.” Click Install Now, and once it’s installed, click Activate.
Configure the Plugin: Most debugging plugins start working immediately upon activation, automatically enabling WP_DEBUG and WP_DEBUG_LOG. Some offer additional features. For example, they might provide a new menu item under Tools > Debug where you can view the log file directly from your dashboard, saving you the trip to FTP or cPanel. Other advanced tools like the “Debug Bar” plugin add a detailed menu to your admin bar, showing database queries, cache information, and other technical details useful for in-depth troubleshooting.

The main advantage of this method is its simplicity and safety. The downside is that it adds another plugin to your site, which means one more thing to keep updated. Both methods achieve the same end goal: creating a debug.log file to help you diagnose issues. Choose the one that best matches your technical comfort level. For more plugin options and strategies, see our guide on Debugging in WordPress.

How to View WordPress Error Logs and Interpret the Data

Now that you’ve enabled logging, it’s time to put on your detective hat and gather some evidence. For an error to be recorded, it must occur while logging is active. The log file won’t retroactively show past issues.

How to locate and view WordPress error logs

First, you must replicate the error. Go to your website and perform the exact action that was causing the problem. Click the button that leads to a broken page, try to save the post that won’t save, or simply visit the homepage if the entire site was down. This action will trigger the underlying PHP error, and because WP_DEBUG_LOG is now active, WordPress will write the details of that error into the log file with a fresh timestamp.

What if the error is intermittent and hard to replicate? In these cases, you may need to leave logging enabled for a longer period and check the log periodically until the error appears. Note the time you see the issue on the site and look for a corresponding timestamp in the log.

The log file, which is always named debug.log, is created inside your site’s /wp-content/ directory. You can access it in a few ways:

Via FTP: Connect to your site with an FTP client (like FileZilla), navigate to the /wp-content/ folder, and you’ll find debug.log. You can download it to your computer to view it.
Via cPanel File Manager: Log in to your hosting account’s control panel, open the File Manager tool, and navigate to your site’s public_html (or equivalent) folder, then into /wp-content/. You can view the file directly in the browser or download it.
Via a Plugin: If you used a debugging plugin that includes a log viewer, you can often view the file directly within your WordPress dashboard, which is the most convenient method.

Once you have the file, open it with a plain text editor like Notepad (Windows), TextEdit (Mac), or a more advanced code editor like VS Code or Sublime Text.

How to interpret and use the information in your logs to fix issues

The debug.log file can look intimidating at first, as it may contain dozens of entries. However, you don’t need to be a senior developer to understand the most important parts. A typical fatal error entry looks like this:

[01-Jan-2024 10:30:45 UTC] PHP Fatal error: Call to undefined function broken_function() in /home/user/public_html/wp-content/plugins/my-bad-plugin/my-bad-plugin.php on line 50

Let’s break it down:

Timestamp: [01-Jan-2024 10:30:45 UTC] shows exactly when the error occurred.
Error Severity: PHP Fatal error: indicates a site-breaking issue. Other types include PHP Warning or PHP Notice.
Error Description: Call to undefined function broken_function() explains what went wrong. The code tried to use a function that doesn’t exist.
File Path: /home/user/public_html/wp-content/plugins/my-bad-plugin/my-bad-plugin.php is the GPS coordinate for your problem. This path clearly points to a plugin named “my-bad-plugin.”
Line Number: on line 50 gives you the exact line of code causing the error.

Here’s another common example:

[02-Jan-2024 15:10:20 UTC] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 32768 bytes) in /home/user/public_html/wp-content/plugins/some-plugin/includes/image-processor.php on line 256

This is a memory exhaustion error. The description tells you that a script, in this case located within “some-plugin,” tried to use more memory than your server’s PHP configuration allows. The solution here isn’t to fix the code but to increase your website’s PHP memory limit, usually via wp-config.php or your hosting control panel.

With this information, you can take targeted action. If the path points to a plugin, your first step is to deactivate it. If it points to your active theme, switch to a default theme (like Twenty Twenty-Four) to see if the error disappears. For critical errors like the white screen of death, the log almost always reveals the culprit. Our Fix WordPress Critical Error guide can help you recover your site once you’ve identified the source.

You can also search for the specific error description online. Copying and pasting PHP Fatal error: Allowed memory size of... exhausted or Call to undefined function into Google or the WordPress support forum will often lead you to articles and threads from others who have faced and solved the exact same problem.

Best Practices for Managing and Securing Your Error Logs

Think of your WordPress error logs as a powerful but temporary diagnostic tool, like a mechanic’s code reader for a car. You plug it in to find the problem, but you don’t drive around with it attached forever. Once you’ve identified and solved the problem, you should not leave logging enabled on a live site. Forgetting to turn it off is a common and risky mistake that can compromise both performance and security.

The Security and Performance Risks of Leaving Debug Mode Enabled

Leaving debug mode active on a production website is like leaving your building’s blueprints on the front porch. It creates several significant problems:

Performance Degradation: Every time a notice, warning, or error occurs (and even minor notices happen frequently on many sites), WordPress has to perform a disk write operation to the debug.log file. On a high-traffic site, this can lead to thousands of writes, consuming server I/O resources and slowing down your site’s response time for all users. The log file itself can also grow to hundreds of megabytes or even gigabytes, consuming valuable disk space.
Security Vulnerabilities: This is the most critical risk. Error logs contain detailed information about your site’s underlying structure, including absolute server file paths (/home/username/public_html/...), plugin and theme names, and sometimes even database queries. An attacker could discover the location of your debug.log file (it’s a standard location) and read it to map out your site’s technology stack. If they see you’re using a specific plugin, they can then search for known vulnerabilities in that plugin to craft a targeted attack.
Sensitive Information Leaks: In a worst-case scenario, error messages can inadvertently capture and log sensitive data. This could include user-submitted information from a form, parts of a database query, or even API keys if a connection to a third-party service fails. If your debug.log file is publicly accessible (due to incorrect server permissions), this data is exposed for anyone to find.
Damaged Credibility: If WP_DEBUG_DISPLAY is accidentally set to true, visitors will see raw, unformatted PHP error messages at the top of your pages. This looks highly unprofessional and signals to everyone that your site is broken, severely damaging your brand’s credibility.

These are real-world risks we regularly address in our WordPress Site Security services. For a full evaluation of your site’s security posture, our WordPress Security Audit Complete Guide covers all critical areas.

When to Disable Logging and How to Clean Up

The golden rule is simple: turn logging on only when you are actively troubleshooting, and turn it off immediately after you have resolved the issue.

To disable logging and clean up your site:

If you edited wp-config.php: Connect to your server via FTP or File Manager, open the wp-config.php file, and change define( 'WP_DEBUG', true ); back to define( 'WP_DEBUG', false );. It’s good practice to also comment out or remove the other debug lines (WP_DEBUG_LOG and WP_DEBUG_DISPLAY) to keep your configuration file clean.
If you used a plugin: This is much simpler. Go to Plugins > Installed Plugins in your WordPress dashboard and just Deactivate the debugging plugin.

After disabling logging, you must also delete the debug.log file. It is located in your /wp-content/ directory and can be safely removed via FTP or your file manager. This final step is crucial because it removes any sensitive information that was logged, prevents it from being discovered later, and frees up server disk space. As our guide on Can I Delete error_log in WordPress? explains, these log files are not essential for your site’s day-to-day operation.

Make checking for and removing old debug files a part of your regular site maintenance routine. Our WordPress Maintenance Checklist and WordPress Site Audit guides can help you establish a comprehensive routine to keep your site healthy and secure.

Frequently Asked Questions about WordPress Error Logs

Here are detailed answers to some of the most common questions we hear from clients and readers about WordPress error logging.

What’s the difference between `WP_DEBUG`, `WP_DEBUG_LOG`, and `WP_DEBUG_DISPLAY`?

These three constants, defined in your wp-config.php file, work together as a fine-tuned control panel for your debugging environment. It’s important to understand how they interact.

WP_DEBUG: This is the master switch. Setting it to true tells WordPress to enter a “debugging” state and start paying attention to all PHP errors, warnings, and notices. If WP_DEBUG is false (the default), the other two constants do absolutely nothing.
WP_DEBUG_LOG: This is the recorder. When set to true, it instructs WordPress to save all error output to a file named debug.log located in the /wp-content/ directory. This is the ideal setting for a live site, as it keeps errors hidden from public view.
WP_DEBUG_DISPLAY: This is the on-screen display. When set to true, it tells WordPress to output error messages directly into the HTML of your website pages. This is useful during local development but should always be false on a live, public-facing website for security and professionalism.

For troubleshooting a live site, this is the ideal and safest combination:

define( 'WP_DEBUG', true ); // Turn on debugging
define( 'WP_DEBUG_LOG', true ); // Log errors to a file
define( 'WP_DEBUG_DISPLAY', false ); // Do not show errors on screen
@ini_set( 'display_errors', 0 ); // Extra security to hide errors

This setup logs all errors privately to a file for your review while ensuring your site appears clean and professional to your visitors.

My `debug.log` file is empty or not being created. What’s wrong?

This is a common frustration. If you’ve enabled logging but the debug.log file is nowhere to be found or is completely empty, here are the most likely culprits:

Typos in wp-config.php: Double-check your code. A simple misspelling like WP_DEBAG or a missing semicolon can cause the constants to be ignored. Also, ensure you placed the code above the /* That's all, stop editing! */ line.
File Permissions: For WordPress to create and write to the debug.log file, the /wp-content/ directory must be writable by the server. In most cases, directory permissions should be set to 755. If they are more restrictive (e.g., 750 or 744), the server may not have permission to create the file.
You Haven’t Triggered the Error: The log file will only be created and populated when an actual PHP error, notice, or warning occurs. After enabling logging, you must reproduce the problem you’re investigating to generate a log entry.
Caching Issues: Aggressive server-side or plugin caching might be serving a cached version of the page, preventing the underlying PHP error from executing and thus from being logged. Try clearing all caches before attempting to replicate the error.
Server-Level Logs: In cases of severe configuration errors (like a misconfigured .htaccess file or a major PHP failure), the error might occur before WordPress even loads. In these situations, the error won’t be in debug.log but in your web server’s main error logs (often called error.log or accessible through your hosting control panel). Contact your hosting provider for help accessing these.

Can I view error logs without FTP or cPanel access?

Yes, absolutely. While FTP and cPanel’s File Manager are traditional methods, they are not the only ways to view WordPress error logs:

Debugging Plugins: Many plugins, such as WP Debugging, not only enable logging but also provide a built-in log viewer right in your WordPress admin area (often under “Tools”). This is the most convenient method for non-technical users.
Hosting Provider Tools: Most modern WordPress hosts (like Kinsta, WP Engine, SiteGround) offer dedicated developer tools in their custom control panels. These often include a one-click button to enable debugging and a real-time log viewer.
SSH Access: If you have SSH (Secure Shell) access to your server and are comfortable with the command line, you can connect and view the file directly. A very useful command is tail -f /path/to/wp-content/debug.log, which displays the end of the log file and actively watches for new errors as they happen in real-time.

What is the `error_log` file I see in my directories? Is it the same as `debug.log`?

No, they are different. The debug.log file is created specifically by WordPress when you enable WP_DEBUG_LOG. The error_log file, on the other hand, is typically generated by the web server itself (like Apache) to log general PHP errors. You might find these files in your root directory or other folders where a PHP script has failed. While they can also contain useful information, debug.log is more specific to WordPress and is the primary tool for WordPress-related troubleshooting.

Can I change the location of the `debug.log` file?

Yes, and it’s a great security practice. Leaving debug.log in the default /wp-content/ directory makes it a predictable target for attackers. You can move it to a non-public directory by modifying the WP_DEBUG_LOG constant in your wp-config.php file. Instead of true, provide a full server path to your desired log file:

define( 'WP_DEBUG_LOG', '/home/your_user/private_logs/wp_debug.log' );

This places the log outside the web-accessible public_html folder, making it much more secure.

Conclusion

Knowing how to enable, locate, and view WordPress error logs transforms a frustrating website mystery into a solvable puzzle. When your site breaks, you no longer have to feel helpless or resort to time-wasting guesswork. You now have a systematic, data-driven approach to troubleshooting.

We’ve covered the entire process: how to enable logging safely using either your wp-config.php file or a user-friendly plugin, how to replicate an issue to generate a log, and how to interpret the data within the debug.log file to find the exact plugin, theme, or line of code causing the problem. Most importantly, we’ve stressed the critical importance of disabling debug mode and cleaning up afterward to protect your site’s performance and security. This knowledge empowers you to take control, identify problematic components, and fix issues with confidence before they escalate.

However, even with a clear error log, fixing the underlying issue can be complex. The log might point to a fatal memory exhaustion error, but do you know how to safely increase your site’s PHP memory limit without crashing your server? It might flag a deprecated function in your theme, but do you have the PHP knowledge to find a modern replacement and implement it without breaking your site’s design?

That’s where professional support becomes invaluable. At wpOncall, we’ve spent fifteen years turning confusing error messages into quick, effective fixes. When you see an error, our expert team knows not just what went wrong, but exactly how to resolve it efficiently and safely.

We specialize in comprehensive WordPress website security and support, offering daily updates, backups, and unlimited support to ensure problems are not only solved fast but are often prevented from happening in the first place. While you focus on growing your business, we proactively monitor, maintain, and protect your most important digital asset.

Don’t let WordPress errors hold you back. Let our experts handle your WordPress maintenance and support and enjoy the peace of mind that comes with knowing your site is in capable, experienced hands.