Turndown is a JavaScript library designed to transform HTML documents into structured Markdown. It functions as a flexible engine that parses web content by traversing the document object model and applying rule-based transformations to convert elements into their corresponding text-based syntax.
The tool distinguishes itself through a modular architecture that allows for extensive customization of the conversion process. Users can define custom conversion rules to handle specific elements, implement content filtering to discard unwanted nodes, and configure character escaping to ensure output compatibility. A plugin system further enables the injection of additional rule sets to modify or extend the default formatting logic.
Beyond basic conversion, the library supports the preservation of raw HTML tags and provides granular control over syntax styles for common document elements. These capabilities facilitate automated workflows such as content scraping, data transformation pipelines, and the migration of web content into static site generators.
