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@json-render/react-pdf
React PDF renderer that generates PDF documents from JSON specs using @react-pdf/renderer.
Installation
bash
npm install @json-render/core @json-render/react-pdfQuick Start
typescript
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
typescript
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
| Component | Description |
|---|---|
Document | Top-level PDF wrapper (must be root) |
Page | Page with size (A4, LETTER), orientation, margins |
View | Generic container (padding, margin, background, border) |
Row, Column | Flex layout with gap, align, justify |
Heading | h1-h4 heading text |
Text | Body text (fontSize, color, weight, alignment) |
Image | Image from URL or base64 |
Link | Hyperlink with text and href |
Table | Data table with typed columns and rows |
List | Ordered or unordered list |
Divider | Horizontal line separator |
Spacer | Empty vertical space |
PageNumber | Current page number and total pages |
Custom Catalog
typescript
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:
Nested lists can set repeat.statePath to { "$item": "field" } inside an enclosing repeat.
typescript
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:
typescript
import { schema, standardComponentDefinitions } from "@json-render/react-pdf/server";