Slate JS
Slate JS is a highly customizable framework for building rich-text editors in React applications. It provides a set of building blocks and APIs that allow developers to create complex editor interfaces with features like formatting, embeds, and collaborative editing. Unlike many WYSIWYG editors, Slate uses a JSON-based data model, making it flexible and easy to extend.
Developers should learn Slate JS when they need to build custom rich-text editors that go beyond basic HTML textareas or pre-built solutions, such as for content management systems, note-taking apps, or collaborative tools. It's particularly useful for projects requiring specific formatting rules, real-time collaboration, or integration with custom data structures, as its plugin-based architecture allows for deep customization without being tied to a specific UI.