Streamdown v2: Smaller bundle size and new Remend options
Streamdown v2 cuts bundle size and ships configurable markdown healing for AI streaming UIs.
Why it matters
Developer tooling for AI applications is maturing with performance and UX refinements. This update addresses real friction points in building streaming interfaces—bundle bloat and markdown rendering reliability—that product teams building on LLM APIs face daily.
The key facts
12 to knowStreamdown v2 released with significantly reduced bundle size
Plugin-based architecture enables customization
Built-in caret indicators for streaming content visualization
Configurable Remend markdown-healing library (variable healing intensity)
Drop-in replacement for react-markdown positioned for AI-powered streaming workflows
Most requested feature post-launch was bundle size reduction
Bundle size reduction in v2 (specific metrics not disclosed)
Plugin-based architecture for modularity
Built-in caret indicators for streaming state visualization
Configurable Remend markdown-healing library
Streamdown is drop-in replacement for react-markdown
Published Jan 12, 2026 on Vercel changelog
Go to the source
Vercel Blogvercel.com
Publisher excerpt: Today, we're releasing a major update to Streamdown, our drop-in replacement for react-markdown, designed for AI-powered streaming. The most requested feature since launch has been to reduce the bundle size. Streamdown v2 now ships with a bundle size much smaller than the previous version and uses…