b-open-io/json-render-image

@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 |