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If by “PDF string” you mean HTML produced from a React component, render the component to an HTML string, load it into a Puppeteer page, and call page.pdf(). The result is PDF bytes, not another string. If you already have a PDF encoded as Base64 or text, that is a different task: decode it into bytes rather than passing it to Puppeteer as HTML.
What “PDF string” means in this workflow
React can render a component tree to static HTML markup with renderToStaticMarkup. That markup is an HTML string; it is not a PDF and does not contain PDF bytes. Puppeteer’s page.setContent() accepts that HTML, and page.pdf() generates the PDF as a Uint8Array. In a Node.js application, wrap the returned bytes with Buffer.from() when you need a Buffer.
This distinction matters because there are two very different inputs people may call a “PDF string”:
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- React-generated HTML: use the workflow below to render it as a PDF.
- Existing PDF data encoded as Base64 or text: decode that data to bytes. Do not load it with
page.setContent(); Puppeteer expects HTML markup there.
The example uses an invoice, but the same pipeline works for other static documents. React’s static renderer creates non-interactive markup, so prepare data before rendering and do not rely on browser event handlers or client-side hydration to fill in the PDF.
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Install the packages and prepare a component
In a Node.js project, install React, React DOM, and Puppeteer:
npm install react react-dom puppeteerThe following component uses plain JavaScript and React.createElement, so it does not depend on a JSX transform. Keep document data in the component props; React will escape text values inserted as children.
// Invoice.js
import React from 'react';
const h = React.createElement;
export function Invoice({ invoice }) {
return h('main', { className: 'invoice' },
h('h1', null, 'Invoice ', invoice.number),
h('p', null, `Bill to: ${invoice.customer}`),
h('table', null,
h('thead', null,
h('tr', null,
h('th', null, 'Description'),
h('th', null, 'Amount')
)
),
h('tbody', null,
...invoice.items.map((item, index) =>
h('tr', { key: index },
h('td', null, item.description),
h('td', null, item.amount)
)
)
)
)
);
}For a JSX-based application, you can use the same approach with your existing component and server-side build setup. The important boundary is that the server renderer receives a React node and returns markup; the browser page then lays out that markup for printing.
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Render the React markup and create the PDF
This complete function wraps the component HTML in a document shell, loads it into Puppeteer, creates A4 output with background graphics, and returns the generated bytes as a Node Buffer. The browser is closed in a finally block so an exception during page setup or PDF generation does not leave that browser process open.
// pdf.js
import puppeteer from 'puppeteer';
import { renderToStaticMarkup } from 'react-dom/server';
import { Invoice } from './Invoice.js';
export async function createInvoicePdf(invoice) {
const markup = renderToStaticMarkup(Invoice({ invoice }));
const html = `<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Invoice ${invoice.number}</title>
<style>
@page { size: A4; margin: 18mm; }
body { font: 12pt Arial, sans-serif; color: #222; }
h1 { font-size: 22pt; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 8px; border-bottom: 1px solid #ccc; text-align: left; }
@media print { .invoice { break-inside: avoid; } }
</style>
</head>
<body>${markup}</body>
</html>`;
const browser = await puppeteer.launch();
try {
const page = await browser.newPage();
await page.setContent(html);
const pdfBytes = await page.pdf({
format: 'A4',
printBackground: true,
margin: { top: '18mm', right: '18mm', bottom: '18mm', left: '18mm' },
});
return Buffer.from(pdfBytes);
} finally {
await browser.close();
}
}In this example, Invoice({ invoice }) creates the React element and renderToStaticMarkup() turns it into static markup. Alternatively, if your code already has a React element such as <Invoice invoice={invoice} />, pass that element directly to renderToStaticMarkup().
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The HTML includes a document type, character encoding, viewport, title, and styles. The @page rule sets print dimensions and margins in CSS; the PDF options set them as well. Choose one deliberate source of layout settings for your document and keep them consistent. The sample sets A4 and 18 mm margins in both places to make the intended result explicit.
Return the bytes from an HTTP endpoint
createInvoicePdf() returns bytes; it does not trigger a browser download by itself. An HTTP route can send those bytes with a PDF content type. For example, in an Express handler:
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try {
const invoice = await loadInvoice(req.params.id);
const pdf = await createInvoicePdf(invoice);
res.setHeader('Content-Type', 'application/pdf');
res.setHeader('Content-Disposition', 'attachment; filename="invoice.pdf"');
res.send(pdf);
} catch (error) {
next(error);
}
});Use inline instead of attachment in Content-Disposition if the intended behavior is to display the PDF in the browser rather than prompt for a download. The route example assumes your application already provides loadInvoice() and Express setup; those are application-specific, not Puppeteer APIs.
Choose print layout and rendering options
Puppeteer’s page.pdf() uses print CSS media by default. That means print-specific styles and @page rules can affect output even if the page looks different on screen. If the component’s layout is designed for screen styles instead, call await page.emulateMediaType('screen') before page.pdf(). This changes the media type; it does not remove the need to choose page dimensions and inspect page breaks.
Useful PDFOptions settings include:
format, or explicitwidthandheight, for paper dimensions. The documented default format is Letter, so choose a format appropriate for the intended audience rather than assuming A4 is universal.landscapefor orientation; its documented default isfalse.marginfor top, right, bottom, and left page margins.printBackgroundto include background graphics; the documented default isfalse.preferCSSPageSizeto give CSS page sizing preference when you define size through print CSS.pageRangesto output selected page ranges, andscaleto adjust rendered content size.displayHeaderFooter,headerTemplate, andfooterTemplatefor page headers or footers.pathto save the PDF to a file. Without it,page.pdf()returns the PDF bytes without writing a file.timeoutandwaitForFontsto control PDF-generation waiting behavior. The documented default forwaitForFontsistrue.
Puppeteer’s PDF documentation notes that printing may modify colors. For exact color adjustment, the documentation points to the CSS property -webkit-print-color-adjust; background graphics are a separate concern controlled by printBackground. Include only the visual options the document needs rather than treating one configuration as a universal preset.
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Handle fonts, images, data, and page breaks
The output depends on what the page can load at render time. Puppeteer’s PDF guide says PDF generation waits for fonts by default, but the runtime still needs access to the font files. External fonts, stylesheets, and images can fail if the rendering environment has no network access, authentication is required, or the asset URL is incorrect. Where predictable output matters, use assets available to the process and verify that they load before producing the PDF.
Static rendering does not wait for client-side React effects to fetch data or update the page. Fetch and validate the invoice or other document data before calling renderToStaticMarkup(). React also documents limited Suspense support for renderToStaticMarkup: if a component suspends, it immediately emits its fallback. Resolve required data before the render or ensure the output does not depend on a suspended component.
Long documents need print-specific layout decisions. Use CSS page-break rules and table styles suited to printing, then inspect actual output for clipped content, awkward row splits, unexpected blank pages, and headers or footers that overlap the body. These checks are especially important when content length varies from one request to another.
Troubleshooting common failures
- The PDF contains the literal text or broken layout instead of a component. Confirm that you passed HTML markup generated from a React element, not a Base64 PDF string, a JSON string, or an unrendered component function.
- Only a fallback or incomplete data appears. Load application data before static rendering. A static render does not run client-side effects, and a component that suspends can produce its fallback immediately.
- Styles or images are missing. Check that stylesheets and asset URLs are included in the HTML or otherwise available to the page, and that the browser process can load them. For styles intended only for the screen, confirm whether print media is hiding or changing them.
- Background colors or images disappear. Set
printBackground: true. Color adjustment can also affect the printed appearance; use-webkit-print-color-adjustwhen exact color handling is required. - The printed design differs from the browser preview. Remember that PDF generation uses print media by default. Use print CSS for the document, or explicitly emulate screen media before generating the PDF if screen styling is intended.
- The process cannot launch Chromium in deployment. Check the deployment environment’s browser availability and launch requirements, then configure Puppeteer for that runtime. Do not assume a local development setup and a restricted serverless or container runtime have identical browser dependencies.
- The response is empty, corrupt, or downloads as text. Send the returned bytes without converting them to a string, and set
Content-Type: application/pdf. Check that errors are not being swallowed before the response is sent. - Pages are clipped or have unexpected breaks. Revisit paper size, margins, content width, and print-specific break rules. Check the generated PDF using representative short and long documents.
Performance, reliability, and cost considerations
Generating a PDF requires launching and driving a browser, so it is more operationally involved than returning a pre-existing file. For a small application, the straightforward launch-use-close lifecycle above is easy to reason about. If generation volume grows, measure the browser startup and render time in your own deployment before choosing a process-reuse or queueing strategy; the cited React and Puppeteer API documentation does not establish a universal throughput figure.
Keep the browser cleanup path, handle errors at the request boundary, and avoid starting a new PDF job for repeated requests when your application can safely reuse a previously generated result. Set a suitable request-level policy for long documents and slow external assets. Puppeteer exposes PDF timeout options, but a timeout value should reflect the runtime and document rather than be copied as a universal number.
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There is no per-PDF price in this self-hosted example from the cited APIs. The practical costs depend on the compute environment, browser runtime, and your operations. A hosted rendering option can avoid some browser-management work, but assess it against your security, data handling, layout, and service requirements.
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Can I use this method when my React component contains buttons or forms?
You can render their visual markup, but static HTML does not preserve interactive behavior or make the resulting PDF interactive.
Does this example save a file automatically?
No. It returns bytes; writing to disk or sending a download response is a separate application step.
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