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@json-render/react-pdf

React PDF renderer that generates PDF documents from JSON specs using @react-pdf/renderer.

Installation

npm install @json-render/core @json-render/react-pdf

Quick Start

import { renderToBuffer } from "@json-render/react-pdf";
import type { Spec } from "@json-render/core";

const spec: Spec = {
  root: "doc",
  elements: {
    doc: { type: "Document", props: { title: "Invoice" }, children: ["page"] },
    page: {
      type: "Page",
      props: { size: "A4" },
      children: ["heading", "table"],
    },
    heading: {
      type: "Heading",
      props: { text: "Invoice #1234", level: "h1" },
      children: [],
    },
    table: {
      type: "Table",
      props: {
        columns: [
          { header: "Item", width: "60%" },
          { header: "Price", width: "40%", align: "right" },
        ],
        rows: [
          ["Widget A", "$10.00"],
          ["Widget B", "$25.00"],
        ],
      },
      children: [],
    },
  },
};

const buffer = await renderToBuffer(spec);

Render APIs

import { renderToBuffer, renderToStream, renderToFile } from "@json-render/react-pdf";

// In-memory buffer
const buffer = await renderToBuffer(spec);

// Readable stream (pipe to HTTP response)
const stream = await renderToStream(spec);
stream.pipe(res);

// Direct to file
await renderToFile(spec, "./output.pdf");

All render functions accept an optional second argument: { registry?, state?, handlers? }.

Standard Components

Custom Catalog

import { defineCatalog } from "@json-render/core";
import { schema, defineRegistry, renderToBuffer } from "@json-render/react-pdf";
import { standardComponentDefinitions } from "@json-render/react-pdf/catalog";
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",
    },
  },
  actions: {},
});

const { registry } = defineRegistry(catalog, {
  components: {
    Badge: ({ props }) => (
      <View style={{ backgroundColor: props.color ?? "#e5e7eb", padding: 4 }}>
        <Text>{props.label}</Text>
      </View>
    ),
  },
});

const buffer = await renderToBuffer(spec, { registry });

External Store (Controlled Mode)

Pass a StateStore for full control over state:

import { createStateStore } from "@json-render/react-pdf";

const store = createStateStore({ invoice: { total: 100 } });
store.set("/invoice/total", 200);

Server-Safe Import

Import schema and catalog without pulling in React:

import { schema, standardComponentDefinitions } from "@json-render/react-pdf/server";

Weekly Installs

250

Repository

vercel-labs/json-render

GitHub Stars

13.3K

First Seen

Mar 7, 2026

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