WooCommerce Debug Mode 101: A Beginner’s Guide

WooCommerce debug mode is a lifesaver when your store isn’t performing well. If you’re facing strange errors or slow-loading pages, these problems are directly impacting your sales.

When shoppers face checkout issues or slow loading times, they leave. Without insight, finding the root cause is nearly impossible.

We’ve fixed countless errors using the debug feature while testing for our articles. In this guide, we will show you how to enable and use this feature for efficient troubleshooting.

TL;DR: WooCommerce debug mode uncovers hidden site issues, enabling quick fixes to improve performance. Always use a backup plugin to safeguard your site before making changes, ensuring you can easily restore it if needed.

Why you should enable debugging mode on your WooCommerce site

Reveals hidden site issues

Debug mode pulls back the curtain on your website, showing you what’s happening when things go wrong. Instead of staring at a blank screen, wondering why your site won’t load, you’ll see the actual error messages pointing to the problem. 

Catches problems early

Nobody wants customers to discover site problems first. With debug mode on, you’ll spot issues like checkout glitches or broken product displays before your shoppers do. You’ll see exactly which line of code or plugin is causing trouble, so you can fix it before it impacts your bottom line.

Improves site performance

Slow sites kill sales, it’s that simple. Debug mode shows you exactly what’s creating those annoying delays. Maybe it’s an oversized image, a clunky plugin, or inefficient database queries. 

Enhances customer experience

Every error a shopper sees chips away at their confidence in your store. This feature helps you systematically eliminate these trust-killers by showing exactly when and where they happen.

How to enable WooCommerce debug mode

Take a complete backup of your website before enabling debug mode. This safety measure ensures you can restore your site if anything goes wrong while enabling the debugging mode.

Access your configuration file

1. Connect to your website using FTP or your hosting control panel’s file manager.

2. Navigate to your main WordPress directory (usually public_html or www).

3. Open wp-config.php with a text editor.

Basic debugging code

1. Look for any existing debug settings in the file.

2. If none exist, add these lines before “That’s all, stop editing!“:

define( 'WP_DEBUG', true );

define( 'WP_DEBUG_LOG', true );

define( 'WP_DEBUG_DISPLAY', false );

This activates debugging, creates an error log file, and prevents errors from displaying to your visitors.

Additional debugging options

WooCommerce specific debugging

Add this line to troubleshoot WooCommerce-specific issues:

define( 'WPS_DEBUG', true );

This line of code captures detailed information about WooCommerce operations, helping identify issues with products, checkout processes, and other store functionality.

Script and style debugging

Add these lines to identify problems with JavaScript or CSS files:

define( 'WP_DEBUG_SCRIPTS', true );

define( 'WPS_DEBUG_STYLES', true );

These settings prevent the compression of script and style files. They help troubleshoot visual glitches and functionality issues related to scripts and stylesheets.

DOM parsing debugging

For issues with page structure interactions:

define( 'WPS_DEBUG_DOM', true );

This option shows how WooCommerce interacts with your page structure. It helps identify why certain elements on your page aren’t functioning as expected, such as add-to-cart buttons or product variations.

Cache debugging

If you suspect caching problems:

define( 'WPS_CACHE_DEBUG', true );

This setting logs information about what’s being stored in cache and when cached items are being used or refreshed. It helps identify if stale cached data is causing outdated information to appear in your store.

Once you’ve added the required codes, save the wp-config.php file and upload it back to your server if you edited it locally.

Post-debugging steps

These final steps are crucial to ensure your site returns to optimal performance while maintaining the fixes you’ve made.

Review logs

The first thing you should do is open the debug.log file located in your wp-content folder. This file contains valuable information about what’s been happening on your site. Look for lines that contain words like “error,” “warning,” or “notice” – these highlight specific issues that need attention.

Clear cache

After making changes to fix the identified issues, clear all caches associated with your site. This includes:

1. Your WordPress cache

2. Plugin caches (especially for performance plugins)

3. Browser cache

4. Server cache (if your hosting provides this)

Clearing these caches ensures that your site is truly using your updated files and settings rather than stored versions of the old, problematic ones.

Disable debugging

Once you’ve fixed the issues and verified that your store is working correctly, it’s time to turn off debug mode. This step is extremely important for both performance and security reasons.

Open your wp-config.php file again and find all the debugging settings you added earlier. Change each true value to false like this:

define( 'WP_DEBUG', false );

define( 'WP_DEBUG_LOG', false );

define( 'WP_DEBUG_DISPLAY', false );

Do this for all debugging constants, including any WooCommerce-specific ones you added. Alternatively, you can simply remove these lines completely.

After saving these changes, check your site to make sure everything still works correctly with debugging disabled. 

Parting thoughts

Debug mode reveals what’s happening inside your WooCommerce store, helping you fix problems before customers notice them. Always disable debugging when you’re done troubleshooting.

Make site maintenance a regular habit. Monthly check-ups prevent small issues from becoming major disruptions. Always create a complete backup before making any changes to your site, giving you a safety net if something goes wrong.

These simple practices will help you maintain a stable, high-performing online store that provides a smooth shopping experience for your customers.

FAQs

How do I turn on debug mode in WordPress?

Turn on debug mode by adding define(‘WP_DEBUG’, true); to your wp-config.php file. This logs errors to help diagnose issues. Remember to disable it on live sites for optimal performance.

How do I enable WooCommerce in WordPress?

Enable WooCommerce by installing and activating the plugin from the dashboard. Follow the setup wizard to configure your store. Once configured, your store will be ready to go live.

What is the debug mode?

Debug mode is a feature that logs WordPress site errors. It helps identify and fix issues by providing detailed error information. It’s useful for diagnosing problems without disturbing users.

How to use debugging in WordPress?

Use debugging by activating it in wp-config.php with define(‘WP_DEBUG’, true);. Check wp-content/debug.log for error details. Use this information to address and resolve site issues.