Javascript Errors, jQuery Version and jQuery Migrate

This feature works from plugin version 2.45.

WordPress was built using PHP,  mySQL, HTML, CSS  and Javascript.

When the site run on javascript errors, usually they show up at console log , not a front end,  and  the page fails to execute correctly. Our plugin record errors, also javascript errors and can also send one email to admin.

jQuery is a Javascript framework used by theme and plugin authors and WordPress has included a version of the jQuery library a long time.

Starting with WordPress 3.6, also jQuery Migrate is automatically included on all pages. jQuery Migrate is a javascript library that allows you to preserve the compatibility of your jQuery code developed for versions of jQuery older than 3.6. It basically restores deprecated features and behaviours so that older code will still run properly on the current jQuery version and later. With the update to WordPress 5.5 this migration tool was no longer enabled by default.

From version 5.6, WordPress included a new version of jQuery and some themes and plugins stop working as expected or cause errors because their code was outdated.

Now, with version 5.8, WordPress included jQuery migrate again and you are unable to remove it.

Our plugin can write the errors (also Javascript errors) at error log and you can see them. Just click on Errors at Admin bar or Javascript  at menu (Version 2.45).

Fix all errors asap, requesting support to theme and plugin developers or replacing them if they was abandoned.

Learn more about errors.