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json-render

json-render is an MCP server for Cursor from vercel-labs/json-render. Its token cost is not measured, scanned A, original, Apache-2.0.

A local command setup that runs TypeScript and modern JavaScript files with the `tsx` package. It starts a JSON-render example server that communicates over standard input and output.

In plain words
What is it for?
It helps launch the example MCP server from a project command and execute its TypeScript or ECMAScript module code locally.
Why use it?
It provides a way to run the example server locally without separately compiling the TypeScript file first.

MCP server for Cursor ✓ vendor

Written for Cursor: installed under .cursor/. Also seen: listed in .cursor/mcp.json.

not rated 19krepo +73 yesterday A scan Socket: pass tokens not measured original Apache-2.0

Good fit It helps launch the example MCP server from a project command and execute its TypeScript or ECMAScript module code locally.

Compare 6 mcp servers from other repositories ↓
Install with agentmods
npx agentmods add mcp/vercel-labs/json-render/json-render
View source ↗ vercel-labs/json-render json-render.dev
About the project

json-render is a framework where AI produces user interfaces as structured JSON constrained by a developer-defined component catalogue. It is for building dynamic interfaces from natural-language prompts across web and mobile frameworks.

vercel-labs/json-render · 18,930 stars · on GitHub · json-render.dev

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/vercel-labs/json-render

Made for: Cursor.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for json-render

README.md
[![agentmods](https://agentmods.dev/badge/mcp/vercel-labs/json-render/json-render/github.svg)](https://agentmods.dev/mcp/vercel-labs/json-render/json-render)
Your own site
<a href="https://agentmods.dev/mcp/vercel-labs/json-render/json-render"><img src="https://agentmods.dev/badge/mcp/vercel-labs/json-render/json-render/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for json-render

Your own site · 80×15
<a href="https://agentmods.dev/mcp/vercel-labs/json-render/json-render"><img src="https://agentmods.dev/badge/mcp/vercel-labs/json-render/json-render.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits How audits are shown
Origin original No closer match found in the catalogue.
Security

Grade A, and why

json-render scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

  • pith — 86% identical, 5 lines differ
.cursor/mcp.json · 10 lines

What it actually says

{
  "json-render": {
    "command": "npx",
    "args": [
      "tsx",
      "examples/mcp/server.ts",
      "--stdio"
    ]
  }
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 10 lines scan A d8e39b24b6c1

Subscribe to this mod's changes

json-render is an MCP server published in the GitHub repository vercel-labs/json-render (18,930 stars, last pushed yesterday), licensed Apache-2.0. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-08.

Building agentsLanguagesTypeScript
Related

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