markdown-it/markdown-it
Markdown It
markdown-it is a token-based Markdown compiler and CommonMark-compliant parser that converts structured plaintext markup into HTML. It functions as an extensible markup processor designed to transform text into browser-ready content while managing security and preventing cross-site scripting.
The project is distinguished by a modular plugin system that allows for the extension of parsing capabilities and the addition of custom syntax, such as footnotes, tables, or emojis. It utilizes a two-stage tokenization process to break documents into structural tokens before rendering them into final HTML output.
The tool covers a broad range of content processing capabilities, including block element parsing for lists and headings, inline tokenization for links and images, and typographic character conversion. It also provides security controls to sanitize URI schemes and manage the rendering of raw HTML tags.
Features
- Markdown-to-HTML Transpilers - Transforms Markdown source text into structured HTML following the CommonMark specification.
- Markdown Parsers - Implements a high-performance, CommonMark-compliant parser that converts markdown syntax into structured layouts.
- Markdown to HTML Converters - A tool for converting structured plaintext markup into browser-ready HTML while managing security and XSS prevention.
- Text Tokenization and Segmentation - Converts paragraph text into a stream of structural tokens by isolating links, images, and HTML tags.
- Plugin-Based Syntax Extensions - Provides a modular plugin system for adding custom syntax and specialized document elements.
- Markup Layout Processing - Processes emphasis, blockquotes, lists, tables, and code blocks into structured HTML layout elements.
- Document Parsing Engines - Breaks down Markdown text into structural tokens for advanced processing and custom rendering.
- Plugin Extensibility - Supports a robust plugin system for adding custom syntax like tables, emojis, and footnotes.
- State-Based Parsers - Employs a stack of active rules to process nested inline elements like bold and italic text.
- Block Level Parsing Rules - Uses prioritized regex and state-based rules to identify block-level structures like lists and headings.
- Plugin-Based Architectures - Implements a modular architecture that allows third-party plugins to extend the core parsing and tokenization logic.
- Two-Stage Parsing - Implements a two-stage parsing architecture that separates block-level scanning from inline token extraction.
- Block Tokenizers - Identifies and tokenizes block-level structures such as tables, lists, and headings.
- HTML Rendering - Transforms processed structural tokens into final HTML output using a customizable renderer.
- Parsing Behavior Configurations - Provides detailed option flags and presets to adjust how line breaks, tags, and typography are processed.
- Static Markup Rendering - Converts raw text files into formatted web pages with controlled HTML output and typography.
- Custom Rule Management - Provides controls to activate or deactivate specific parsing rules to customize the final document output.
- Content Sanitization - Provides tools for filtering and securing external data inputs to prevent XSS attacks during HTML rendering.
- Cross-Site Scripting Prevention - Blocks dangerous URI schemes in links to prevent the execution of malicious scripts via rendered output.
- Markdown Rendering Controls - Allows users to toggle the rendering of raw HTML tags to ensure the output is safe for browser display.
- Syntax Highlighting - Integrates with external libraries to provide syntax highlighting for fenced code blocks.
- Markdown - Enables the addition of specialized markup support like footnotes, tables, or emojis via plugins.
- Parsing Tools - Markdown parser with plugin support.
- Markdown Libraries - Extensible JavaScript Markdown parser with high-speed performance.
- Parsing Utilities - Markdown parser with CommonMark support.
