b-open-io/prompts/json-render-image

Claude Code and agent skill by b-open-io/prompts

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Image renderer for json-render that turns JSON specs into SVG and PNG images via Satori. Use when working with @json-render/image, generating OG images from JSON, creating social cards, or rendering AI-generated image specs.

Install

npx vskill@latest install b-open-io/prompts/json-render-image

SKILL.md

@json-render/image

Image renderer that converts JSON specs into SVG and PNG images using Satori.

Quick Start

typescript
import { renderToPng } from "@json-render/image/render";
import type { Spec } from "@json-render/core";
const spec: Spec = {
root: "frame",
elements: {
frame: {
type: "Frame",
props: { width: 1200, height: 630, backgroundColor: "#1a1a2e" },
children: ["heading"],
},
heading: {
type: "Heading",
props: { text: "Hello World", level: "h1", color: "#ffffff" },
children: [],
},
},
};
const png = await renderToPng(spec, {
fonts: [{ name: "Inter", data: fontData, weight: 400, style: "normal" }],
});

Using Standard Components

typescript
import { defineCatalog } from "@json-render/core";
import { schema, standardComponentDefinitions } from "@json-render/image";
export const imageCatalog = defineCatalog(schema, {
components: standardComponentDefinitions,
});

Adding Custom Components

typescript
import { z } from "zod";
const catalog = defineCatalog(schema, {
components: {
...standardComponentDefinitions,
Badge: {
props: z.object({ label: z.string(), color: z.string().nullable() }),
slots: [],
description: "A colored badge label",
},
},
});

Standard Components

ComponentCategoryDescription
FrameRootRoot container. Defines width, height, background. Must be root.
BoxLayoutContainer with padding, margin, border, absolute positioning
RowLayoutHorizontal flex layout
ColumnLayoutVertical flex layout
HeadingContenth1-h4 heading text
TextContentBody text with full styling
ImageContentImage from URL
DividerDecorativeHorizontal line separator
SpacerDecorativeEmpty vertical space

Key Exports

ExportPurpose
renderToSvgRender spec to SVG string
renderToPngRender spec to PNG buffer (requires @resvg/resvg-js)
schemaImage element schema
standardComponentsPre-built component registry
standardComponentDefinitionsCatalog definitions for AI prompts

Sub-path Exports

ExportDescription
@json-render/imageFull package: schema, components, render functions
@json-render/image/serverSchema and catalog definitions only (no React/Satori)
@json-render/image/catalogStandard component definitions and types
@json-render/image/renderRender functions only

Security

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