codegen
Code generation utilities for json-render. Use when generating code from UI specs, building custom code exporters, traversing specs, or serializing props for @json-render/codegen.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/vercel-labs/json-render --skill codegen- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads codegen automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
@json-render/codegen
Framework-agnostic utilities for generating code from json-render UI trees. Use these to build custom code exporters for Next.js, Remix, or other frameworks.
Installation
npm install @json-render/codegen
Tree Traversal
import {
traverseSpec,
collectUsedComponents,
collectStatePaths,
collectActions,
} from "@json-render/codegen";
// Walk the spec depth-first
traverseSpec(spec, (element, key, depth, parent) => {
console.log(`${" ".repeat(depth * 2)}${key}: ${element.type}`);
});
// Get all component types used
const components = collectUsedComponents(spec);
// Set { "Card", "Metric", "Button" }
// Get all state paths referenced
const statePaths = collectStatePaths(spec);
// Set { "analytics/revenue", "user/name" }
// Get all action names
const actions = collectActions(spec);
// Set { "submit_form", "refresh_data" }
Serialization
import {
serializePropValue,
serializeProps,
escapeString,
type SerializeOptions,
} from "@json-render/codegen";
// Serialize a single value
serializePropValue("hello");
// { value: '"hello"', needsBraces: false }
serializePropValue({ $state: "/user/name" });
// { value: '{ $state: "/user/name" }', needsBraces: true }
// Serialize props for JSX
serializeProps({ title: "Dashboard", columns: 3, disabled: true });
// 'title="Dashboard" columns={3} disabled'
// Escape strings for code
escapeString('hello "world"');
// 'hello \"world\"'
SerializeOptions
interface SerializeOptions {
quotes?: "single" | "double";
indent?: number;
}
Types
import type { GeneratedFile, CodeGenerator } from "@json-render/codegen";
const myGenerator: CodeGenerator = {
generate(spec) {
return [
{ path: "package.json", content: "..." },
{ path: "app/page.tsx", content: "..." },
];
},
};
Building a Custom Generator
import {
collectUsedComponents,
collectStatePaths,
traverseSpec,
serializeProps,
type GeneratedFile,
} from "@json-render/codegen";
import type { Spec } from "@json-render/core";
export function generateNextJSProject(spec: Spec): GeneratedFile[] {
const files: GeneratedFile[] = [];
const components = collectUsedComponents(spec);
// Generate package.json, component files, main page...
return files;
}
FAQ
What does the codegen skill do?
Code generation utilities for json-render. Use when generating code from UI specs, building custom code exporters, traversing specs, or serializing props for @json-render/codegen.
How do I install codegen?
Run npx skills add https://github.com/vercel-labs/json-render --skill codegen in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/codegen/ (personal) or .claude/skills/codegen/ (project).
Which AI agents can use codegen?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is codegen safe to install?
Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains codegen?
It is published by vercel-labs in vercel-labs/json-render, and it is an official skill from the maker of the technology it covers. It has 8,864 recorded installs.
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