ProseMirror

ProseMirror is a toolkit for building rich text editors. It provides a data structure called a document, which represents the content of the editor, and a set of tools for manipulating that document. The core of ProseMirror is a functional programming approach to editing, where changes to the document are modeled as transactions. This makes it highly composable and extensible.

The toolkit consists of several key components. The schema defines the types of nodes and marks that can exist in the document, such as paragraphs, headings, and text styles. The ProseMirror editor itself is a React-like view that renders the document and handles user input. Plugins can be added to extend the editor's functionality, offering features like collaboration, spell checking, or custom formatting.

ProseMirror prioritizes control and flexibility, allowing developers to build highly customized editing experiences. It is known for its robust handling of complex editing scenarios and its ability to integrate with various backend systems. The toolkit is open-source and actively maintained, making it a popular choice for web-based rich text editing solutions.