DemoSep 19, 2026

json-render + Jev

Vercel Labs experiment wiring TypeSafe Jev into json-render so Generative UI specs compose from your catalog in milliseconds — your components, actions, and design system.

Chris Tate wired TypeSafe Jev into json-render, Vercel Labs' Generative UI framework. Instead of an LLM freely inventing UI, Jev picks from your predefined component catalog and actions — then json-render renders the spec instantly.

The demo shows dashboards and forms appearing in milliseconds from natural-language prompts, constrained to components you own.

Try it

Clone the repo and explore the experimental Jev APIs:

experimental_composeSpec
experimental_createEvaluator

See apps/web/lib/jev/ and the Jev docs in the json-render site.

git clone https://github.com/vercel-labs/json-render
cd json-render
pnpm install
pnpm dev