Instant Generative UI with json-render and Jev

Melvin Vivas · X video post · 2026-09-19 · Open on X

Topics: Prompt & Context Engineering, AI Dev Tools & Productivity · Level: intermediate

Summary

The creator shares an experiment that combines json-render with the Jev model to render generative UI in milliseconds, using your own components, actions and design system. He sees it as a step toward using Jev for coding.

Key points

• Generative UI: the model picks and renders UI components instead of writing free text
• json-render plus Jev renders UI from your own components, actions and design system
• Because Jev returns typed decisions, rendering takes milliseconds

Resources mentioned

• json-render · tool · github.com · free
  A library for rendering UI from JSON specs using your own component catalog; here it was paired with Jev for generative UI.
• Jev (TypeSafe AI) · tool · typesafe.ai · free
  TypeSafe's new post-training algorithm for calibrated, confidence-scored decisions, pitched as a replacement for RLHF.
  Also in: JevDev: Open-Source UI Tool for Experimenting with Jev (Typesafe.ai) (Melvin Vivas on X · notes), jev-dev: A UI Tool to Keep Run History When Experimenting with Jev (Melvin Vivas on X · notes), JevDev: Open-Source UI for Experimenting with Jev by Typesafe.ai (Melvin Vivas on X · notes), Building a Jev Session-History Tool with Codex and Astra (Melvin Vivas on X · notes) and 7 more

Try this

• Build a generative UI demo where Jev picks components from your design system and json-render renders them