image

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.

@json-render/image

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

Quick Start

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

import { defineCatalog } from "@json-render/core";
import { schema, standardComponentDefinitions } from "@json-render/image";

export const imageCatalog = defineCatalog(schema, {
  components: standardComponentDefinitions,
});

Adding Custom Components

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

Component	Category	Description
`Frame`	Root	Root container. Defines width, height, background. Must be root.
`Box`	Layout	Container with padding, margin, border, absolute positioning
`Row`	Layout	Horizontal flex layout
`Column`	Layout	Vertical flex layout
`Heading`	Content	h1-h4 heading text
`Text`	Content	Body text with full styling
`Image`	Content	Image from URL
`Divider`	Decorative	Horizontal line separator
`Spacer`	Decorative	Empty vertical space

Key Exports

Export	Purpose
`renderToSvg`	Render spec to SVG string
`renderToPng`	Render spec to PNG buffer (requires `@resvg/resvg-js`)
`schema`	Image element schema
`standardComponents`	Pre-built component registry
`standardComponentDefinitions`	Catalog definitions for AI prompts

Sub-path Exports

Export	Description
`@json-render/image`	Full package: schema, components, render functions
`@json-render/image/server`	Schema and catalog definitions only (no React/Satori)
`@json-render/image/catalog`	Standard component definitions and types
`@json-render/image/render`	Render functions only