JFG Media

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

Pedro Avelar

A simple plugin to log errors in real time in a metabox in the admin panel, too integrated with WP-CLI.
For the run command with WP-CLI is necessary to activate the plugin and install WP-CLI.
When running, paste the command <code>wp slvpl logs-erros</code> into the terminal, by default the number of lines is 1000 but you can control the number of lines through the <code>--num_linhas</code> parameter
For the example: <code>wp slvpl logs-erros [--num_linhas=<num_linhas>]</code> or 
better in the example <code>wp slvpl logs-erros --num_linhas=100</code>.

Simple Log Viewer

A simple plugin to log errors in real time in a metabox in the admin panel, too integrated with WP-CLI

JS Error Logger vs Simple Log Viewer