JS Error Logger

The plugin catches most JS errors, logs them, and displays them in a dashboard widget.

Here are some of its features:

• Except for the plugin settings, there is no database storage involved. Log is written in a “.log” file.
• Display latest JS errors in a dashboard widget.
• Refresh errors from the dashboard widget.
• See the full error log on a separate page.
• Ignore errors if the user agent contains a specific string.
• Ignore errors if the error contains a specific string.
• Ignore errors if the script url contains a specific string.
• See which page and which script triggered the errors.
• Choose the maximum amount of errors to log per page load.
• Exclude logging errors from specific post types.
• Choose how ajax calls are made.

Developer hooks and filters

The plugin cleans the log every 24 hours, to only keep the last 100 entries.
You may use the “jserrlog_max_log_entries” WP filter to enable more or less entries, by returning an integer: add_filter('jserrlog_max_log_entries',function(){return 200;})

Alter error data:
You may use the “jserrlog_pre_insert_error” WP filter to modify the error data before it’s inserted into the log file: add_filter('jserrlog_pre_insert_error',function($error_data){return $error_data;})

Trigger integrations:
You may use the “jserrlog_after_log” WP hook to trigger an action (Slack notification, etc.) after an error was logged: add_action('jserrlog_after_log',function($error_data){//do something})

Backup old errors:
You may use the “jserrlog_before_log_maintenance” WP hook to trigger an action (archive errors, etc.) before old errors are deleted: add_action('jserrlog_before_log_maintenance',function($errors){//do something})

Request hardening:
You may use the “jserrlog_enforce_same_host_origin” WP filter to require same-host Origin/Referer checks for logging requests (default true): add_filter('jserrlog_enforce_same_host_origin',function(){return true;})
You may use the “jserrlog_rate_limit_requests” and “jserrlog_rate_limit_window” WP filters to control request throttling (defaults: 60 requests per 60 seconds): add_filter('jserrlog_rate_limit_requests',function(){return 120;}); add_filter('jserrlog_rate_limit_window',function(){return 60;});
You may use the “jserrlog_max_payload_bytes”, “jserrlog_max_batch_errors” and “jserrlog_max_error_field_length” WP filters to limit incoming payload sizes (defaults: 16384 bytes, 20 errors per batch, 512 chars per field): add_filter('jserrlog_max_payload_bytes',function(){return 32768;});
You may use the “jserrlog_duplicate_window” WP filter to suppress duplicate errors for a short period (default: 60 seconds): add_filter('jserrlog_duplicate_window',function(){return 30;});

Multisite

The plugin works with multisite. There’s one error log per site.