JFG Media

The plugin catches most JS errors, logs them, and displays them in a dashboard widget.
Here are some of its features:
<ul>
<li>
Except for the plugin settings, there is no database storage involved. Log is written in a “.log” file.
</li>
<li>
Display latest JS errors in a dashboard widget.
</li>
<li>
Refresh errors from the dashboard widget.
</li>
<li>
See the full error log on a separate page.
</li>
<li>
Ignore errors if the user agent contains a specific string.
</li>
<li>
Ignore errors if the error contains a specific string.
</li>
<li>
Ignore errors if the script url contains a specific string.
</li>
<li>
See which page and which script triggered the errors.
</li>
<li>
Choose the maximum amount of errors to log per page load.
</li>
<li>
Exclude logging errors from specific post types.
</li>
<li>
Choose how ajax calls are made.
</li>
</ul>
<h4>Developer hooks and filters</h4>
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: <code>add_filter('jserrlog_max_log_entries',function(){return 200;})</code>
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: <code>add_filter('jserrlog_pre_insert_error',function($error_data){return $error_data;})</code>
Trigger integrations: 
You may use the “jserrlog_after_log” WP hook to trigger an action (Slack notification, etc.) after an error was logged: <code>add_action('jserrlog_after_log',function($error_data){//do something})</code>
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: <code>add_action('jserrlog_before_log_maintenance',function($errors){//do something})</code>
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): <code>add_filter('jserrlog_enforce_same_host_origin',function(){return true;})</code> 
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): <code>add_filter('jserrlog_rate_limit_requests',function(){return 120;}); add_filter('jserrlog_rate_limit_window',function(){return 60;});</code> 
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): <code>add_filter('jserrlog_max_payload_bytes',function(){return 32768;});</code> 
You may use the “jserrlog_duplicate_window” WP filter to suppress duplicate errors for a short period (default: 60 seconds): <code>add_filter('jserrlog_duplicate_window',function(){return 30;});</code>
<h4>Multisite</h4>
The plugin works with multisite. There’s one error log per site.

JS Error Logger

Logs front-end javascript errors, and displays them in a dashboard widget

Pierre Lannoy

Hosterra

Capture and log events, metrics and traces on your site. Make WordPress observable – finally!
De-facto standard stack for WordPress observability, DecaLog provides reliable and powerful logging, monitoring and tracing features for WordPress core, PHP, database, plugins and themes.
DecaLog captures events generated by WordPress core, PHP, database, plugins and themes, collates metrics and KPIs and follows traces of the full WordPress execution. It has the ability to enrich these events, metrics and traces with many details regarding their triggering, before storing them in WordPress database or passing them to external services.
If you don’t want to use external services, DecaLog provides the tools to leverage all the benefits of observability right in the WordPress admin dashboard. It supports multisite logs delegation and contains many features to help to protect personal information (user pseudonymization, IP obfuscation, etc.).
For a full list of supported – internal or third-party – services please, jump to the official <a href="https://perfops.one/decalog#services" rel="nofollow ugc">supported services list</a>.
DecaLog can be used in dev/debug phases or on production sites: it has nearly no resource impact on the server. It provides an extensive set of WP-CLI commands to help operations too.
<blockquote>
DecaLog is part of <a href="https://perfops.one/" rel="nofollow ugc">PerfOps One</a>, a suite of free and open source WordPress plugins dedicated to observability and operations performance.
</blockquote>
<h4>Developers</h4>
If you’re a plugins / themes developer and want to take advantage of the logging features of DecaLog, there’s a <a href="https://decalog.io/" rel="nofollow ugc">DecaLog SDK</a> for you.
<h4>Support</h4>
This plugin is free and provided without warranty of any kind. Use it at your own risk, I’m not responsible for any improper use of this plugin, nor for any damage it might cause to your site. Always backup all your data before installing a new plugin.
Anyway, I’ll be glad to help you if you encounter issues when using this plugin. Please read carefully the FAQ at the bottom of this page before requesting support.
<h4>Privacy</h4>
This plugin, as any piece of software, is neither compliant nor non-compliant with privacy laws and regulations. It is your responsibility to use it – by activating the corresponding options or services – with respect for the personal data of your users and applicable laws.
This plugin doesn’t set any cookie in the user’s browser.
This plugin may handle personally identifiable information (PII). If the GDPR or CCPA or similar regulation applies to your case, you must use the anonymization options embedded in the plugin and/or adapt your processes (consent management, security measure, treatment register, etc.).
<h4>Donation</h4>
If you like this plugin or find it useful and want to thank me for the work done, please consider making a donation to <a href="https://www.laquadrature.net/en" rel="nofollow ugc">La Quadrature Du Net</a> or the <a href="https://www.eff.org/" rel="nofollow ugc">Electronic Frontier Foundation</a> which are advocacy groups defending the rights and freedoms of citizens on the Internet. By supporting them, you help the daily actions they perform to defend our fundamental freedoms!

DecaLog

Very nice to be able to push certain events to New Relic logs. I can even see Wordfence alerts and user logins coming in which is awesome! 

Great plugin!

Capture and log events, metrics and traces on your site. Make WordPress observable - finally!

JS Error Logger vs DecaLog