Streamdown

Streamdown, created and maintained by Vercel as open-source software, is a markdown renderer designed for streaming content from AI models, highly interactive, customizable, and easy to use for displaying AI-generated text with enhanced real-time formatting. A streaming experience provides built-in caret indicators and animations showing content being generated in real time, code highlighting uses Shiki-powered syntax highlighting with copy and download functionality, and advanced content support includes LaTeX math rendering, Mermaid diagrams, and proper CJK character handling. Security tools provide link safety modals and origin verification, customization lets developers override components and apply custom styles, and the library is lightweight with tree-shakeable plugins.