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Use a headless browser to render your HTML and CSS, call Puppeteer’s or Playwright’s page.pdf(), then send the returned bytes from an Express route with the application/pdf content type. For reliability, reuse a browser process when appropriate, create and close a page per request, wait for critical assets, and set timeouts and concurrency limits for your deployment. One important visual detail: PDF generation uses print CSS by default, not screen CSS.
Choose a rendering approach
For modern HTML and CSS, a headless browser is the practical default: it renders the page with a browser engine, then produces PDF bytes. Puppeteer and Playwright both expose page-level PDF generation. Neither is universally better for this task; choose based on your runtime packaging, deployment environment, existing test stack, API conventions, and the PDF options your document needs.
- Puppeteer: Its documentation directs developers to
Page.pdf()for printing PDFs. It documents waiting for fonts by default during PDF generation. - Playwright: Its Page API documents
page.pdf()as returning a PDF buffer and provides an API to emulate screen media.
The examples below use Puppeteer. They show one reasonable implementation pattern, not a claim that a particular deployment has been tested. The same route shape works with Playwright, with library-specific setup and page APIs.
Build an Express PDF endpoint with Puppeteer
Install the dependencies
In an existing Node.js project, install Express and Puppeteer:
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npm install express puppeteerPuppeteer launches a browser for rendering. Confirm that the browser can be installed and run in your deployment environment; serverless platforms, containers, and restricted hosts can have different runtime requirements.
Create the route
This example accepts a URL identifying a report page, navigates to it, waits for network activity to settle, generates an A4 PDF, and returns the PDF buffer. In production, do not pass arbitrary user-controlled URLs through to the browser; the security section explains why.
const express = require('express');
const puppeteer = require('puppeteer');
const app = express();
let browser;
async function getBrowser() {
if (!browser || !browser.connected) {
browser = await puppeteer.launch({ headless: true });
}
return browser;
}
app.get('/report.pdf', async (req, res, next) => {
let page;
try {
const target = new URL(req.query.url);
// Replace this example allowlist with the origins your app needs.
const allowedOrigins = new Set(['https://reports.example.com']);
if (!allowedOrigins.has(target.origin)) {
return res.status(400).send('URL origin is not allowed');
}
const browser = await getBrowser();
page = await browser.newPage();
page.setDefaultNavigationTimeout(30_000);
page.setDefaultTimeout(30_000);
await page.goto(target.href, { waitUntil: 'networkidle2' });
const pdf = await page.pdf({
format: 'A4',
printBackground: true
});
res.type('application/pdf').send(pdf);
} catch (error) {
next(error);
} finally {
if (page) {
await page.close().catch(() => {});
}
}
});
app.listen(3000, () => {
console.log('PDF service listening on port 3000');
});Start the server, then request /report.pdf with a URL on the configured allowed origin. Express’s res.send() accepts a Buffer; res.type('application/pdf') sets the response MIME type so clients can identify the response as a PDF.
The example keeps the browser process warm and creates a new page for each request. It closes the page in finally, including when navigation or PDF generation fails. If your service shuts down gracefully, close the browser process as part of its shutdown handling. Reuse reduces repeated browser startup overhead, but it does not establish a safe request capacity: measure your workload and set a concurrency limit appropriate to your host.
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Render HTML held by your application
If the report is generated from a trusted template rather than an existing URL, use page.setContent() instead of navigating to a URL. For example, replace the page.goto() line with:
await page.setContent(renderReportHtml(req.query), {
waitUntil: 'networkidle'
});renderReportHtml() should escape or safely encode user-provided values and return a complete HTML document. Do not interpolate untrusted strings into executable markup or scripts.
Control print styling, page breaks, and colors
Puppeteer’s PDF generation uses the print CSS media type by default. That means a page can look different in a PDF than it does in a normal browser window: print styles may change layout, hide controls, or alter colors. Playwright has the same print-media default.
Make a deliberate media choice
For a document designed to be printed or saved, keep print media and write print-specific CSS. If the PDF should follow screen styles, switch media before calling page.pdf():
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await page.emulateMediaType('screen');
const pdf = await page.pdf({ format: 'A4', printBackground: true });With Playwright, the corresponding choice is to use its page.emulateMedia() API. Do not assume a screen-looking page automatically produces a screen-faithful PDF; verify the rendered output.
Add document-specific print rules
Put page layout rules in the document’s stylesheet. For example, use print media rules to hide interactive controls and prevent a heading from being separated from its content:
@media print {
.interactive-controls {
display: none;
}
h1, h2 {
break-after: avoid;
}
.new-page {
break-before: page;
}
}Set PDF margins in the PDF options when those are a document-level setting, and use CSS page rules where page-specific layout belongs. Check long tables, oversized images, and sections that may split across pages. A layout that fits a browser viewport may overflow, break awkwardly, or produce extra pages when printed.
Preserve colors and backgrounds intentionally
Printed colors may be modified by default. Puppeteer’s Page.pdf reference recommends -webkit-print-color-adjust when exact colors are needed. Add it selectively where the design depends on color, and retain printBackground: true when backgrounds should appear in the PDF:
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@media print {
.brand-color {
-webkit-print-color-adjust: exact;
}
}Test colors, fonts, images, and page breaks in the same kind of environment that will serve the document. Browser version, font availability, external asset access, and print styles can all affect the result.
Wait for fonts and important assets
Puppeteer documents that Page.pdf() waits for fonts to load by default. That helps with web fonts, but your document can still fail to match expectations if a font or image is unavailable, blocked, or slow. For critical images, you can explicitly wait until image elements have completed loading before generating the PDF:
await page.evaluate(async () => {
const images = Array.from(document.images);
await Promise.all(images.map((image) => {
if (image.complete) return Promise.resolve();
return new Promise((resolve) => {
image.addEventListener('load', resolve, { once: true });
image.addEventListener('error', resolve, { once: true });
});
}));
});This waits for each image to either load or fail; it does not make a failed image valid. If assets are essential, record or check failures and decide whether to reject the document or render with missing assets. Use bounded navigation and rendering timeouts so an unavailable font, image, or page cannot hold a request indefinitely.
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Treat URLs and markup as a security boundary
A browser rendering a user-supplied URL can make server-side network requests. Restrict navigation to approved origins, validate template data, and do not let untrusted markup trigger requests to internal services or other unintended destinations. An origin allowlist is a starting point, not a complete security model for every application.
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If clients can submit HTML, keep it isolated from privileged application data and avoid executing user-controlled scripts. Consider which outbound resources the browser may load, and enforce network restrictions at the infrastructure layer where appropriate.
Limit public access and expensive work
PDF rendering consumes browser and server resources. For a public endpoint, use authentication, rate limits, request-size limits, and queueing where needed. Set a maximum number of concurrent renders based on measurement rather than a guessed universal value. Ensure every path closes its page; otherwise failed or slow work can accumulate browser resources.
Measure before setting capacity
The cited official library documentation does not publish a universal throughput or memory figure for this kind of endpoint. Test representative templates in the target environment, including the actual fonts, asset sizes, browser version, and concurrency. Track render duration, failures, timeouts, and resource use; tune queue depth and concurrency from those observations.
Troubleshoot common PDF problems
- The PDF differs from the browser page: PDF output defaults to print media. Inspect
@media printrules and decide whether the document should use print styling or emulate screen media. - Background colors are missing: Check that
printBackground: trueis set. For colors that must remain exact, apply-webkit-print-color-adjustin print CSS. - A web font or image is missing: Check that the browser can reach the asset and that the URL is valid in the deployed environment. Wait for required assets before PDF generation, and handle failed assets explicitly rather than waiting without a bound.
- The request hangs or fails on slow pages: Set navigation and rendering timeouts, identify which external asset or page request is slow, and avoid waiting indefinitely for all network activity. Choose a wait condition that suits the page’s behavior.
- The endpoint returns an error after a render failure: Pass failures to Express error middleware with
next(error), and close the page in afinallyblock. Log enough context to diagnose the failed job without exposing sensitive document contents. - The host cannot launch the browser: Check browser installation and runtime compatibility for the actual container or hosting platform. Browser packaging and launch requirements are deployment-specific; do not assume a local development setup will behave identically in production.
- Capacity drops under concurrent requests: Measure memory and render duration with representative documents, then cap concurrency or queue jobs. Reusing a browser can reduce startup overhead, but does not remove per-page rendering costs.
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Frequently asked questions
Can I generate a PDF without saving it to disk?
Yes. The page-level PDF method returns bytes that you can send directly as a response Buffer, as in the Express example; a file path is not required for that pattern.
Should I use a URL or set the HTML directly?
Navigate to a URL when the page already exists and is accessible to the rendering browser. Use page.setContent() when your application creates the document HTML from a controlled template.
Is there a standard number of PDF requests one browser can handle?
No universal throughput or memory figure is established by the cited official documentation. Measure your templates and deployment environment before choosing concurrency.
Quick Recap
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