JS Categories List Widget is a WordPress plugin designed to enhance the personalization of your site by providing a collapsible list of categories. This tool is particularly useful for optimizing sidebar space or managing categories within posts, utilizing vanilla JavaScript to ensure compatibility across all browsers. The plugin supports Gutenberg blocks, making it easy to integrate into any Full Site Editing (FSE) theme or Gutenberg-compatible theme, thus allowing users to customize their layout seamlessly.

The plugin boasts a variety of features including the ability to include or exclude specific categories, auto-expand selected categories along with their parent or child categories, and multiple instance support. Users can customize the widget's title, the trigger symbol for expanding/collapsing categories, and the display order. Additional options include showing the number of posts in each category and the ability to display empty categories, making it a versatile choice for website personalization.