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To call wkhtmltopdf from Node.js, install the wkhtmltopdf command-line program separately, then launch it asynchronously with Node’s node:child_process API. The npm package named wkhtmltopdf is a wrapper; it does not include the executable. For most server code, execFile with an argument array is a straightforward starting point because it does not invoke a shell by default.
Install and verify the executable
- Install a
wkhtmltopdfbinary for the operating system and architecture used by your application. The project download page lists the 0.12.6 stable series, released June 11, 2020; its download matrix describes that release and is not a guarantee of compatibility with every current environment. See the official downloads page. - Verify the executable is available to the same user and environment that runs Node:
wkhtmltopdf --version. If that command is not found, add the binary’s directory to the processPATHor use its explicit path in your Node code. - If using the npm wrapper, install it separately with
npm install wkhtmltopdf. Its README documents the wrapper API, but the executable still needs to be installed independently: npm package README. - Test in the target production image, including fonts, permissions, network access and any local CSS, image or font paths your page requires.
The reviewed npm package page identifies wrapper version 0.4.0 and does not establish a current compatibility promise for modern Node.js releases. Confirm the wrapper and binary against your actual runtime before relying on them.
Call wkhtmltopdf directly with execFile
For a URL-to-PDF conversion, pass the executable and each option as a separate argument. The following example writes to a temporary file and reports failures without blocking Node’s event loop:
import { execFile } from 'node:child_process';
const inputUrl = 'https://example.test/report';
const outputPath = '/tmp/report.pdf';
execFile(
'wkhtmltopdf',
['--quiet', inputUrl, outputPath],
{ timeout: 30_000 },
(error, stdout, stderr) => {
if (error) {
console.error('wkhtmltopdf failed', {
message: error.message,
code: error.code,
signal: error.signal,
stderr: stderr.toString(),
});
return;
}
console.log(`PDF written to ${outputPath}`);
},
);Save this as an ES module (for example, convert.mjs) and run it with Node. Replace the URL and output location with values appropriate to your service; make sure the output directory exists and is writable. Node’s execFile accepts a command, argument array and options, and launches without a shell unless you explicitly request one. See Node.js child process documentation.
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In an HTTP service, do not send a success response until the child has completed successfully and the output is ready. Treat nonzero exit status as failure; a file can exist even when conversion did not finish correctly. Set a timeout and cancellation policy suited to your workload, and remove temporary files after delivery or on failure.
Use an explicit binary path when PATH is unreliable
When the executable is installed outside the service’s normal search path, pass its absolute path as the first argument instead of 'wkhtmltopdf', for example '/usr/local/bin/wkhtmltopdf' where that is the actual installed location. Do not assume this example path exists on your host.
Convert HTML you have written to a file
You can write trusted, application-generated HTML to a temporary file and pass that file as the input argument. For local pages, assets such as stylesheets and fonts may require local-file access; the command’s documentation says access is disabled by default for a local input page reading other local files. Use --allow only for the specific directories the conversion needs, and check behavior with the exact binary in deployment. See the command usage documentation.
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Use the npm wrapper when its stream API fits
The wrapper can accept a URL or HTML input and pipe generated output to a writable stream. Its README also documents options and an optional callback. Set its documented command property to an explicit executable path if PATH lookup is unsuitable. The package is a convenience layer around the separately installed program, not a replacement for installing it. Consult the package README for the API shape and verify it against your installed versions.
Handle output, timeouts and streaming deliberately
For small conversions, writing to a temporary file and serving that file after successful completion is operationally simple. For larger output or a response that needs to stream, use an asynchronous, stream-oriented child-process design such as spawn. Connect the child’s output to a writable destination and handle both process errors and completion status. If the process exits unsuccessfully, stop or invalidate the downstream response rather than treating partial PDF bytes as a valid document.
Node’s synchronous child-process methods block the event loop while the process runs; use asynchronous APIs in a server so other requests can continue to be handled. Set limits on conversion time and concurrent processes, and clean up child processes and temporary files on request cancellation or timeout. The appropriate limits depend on the workload; the source materials establish no universal performance figure.
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Security: do not process untrusted HTML
The wkhtmltopdf project warns: “Do not use wkhtmltopdf with any untrusted HTML – be sure to sanitize any user-supplied HTML/JS, otherwise it can lead to complete takeover of the server it is running on!” Sanitization alone should not be treated as a complete sandbox. Prefer controlled templates and data, run the converter with minimal privileges, and restrict its filesystem and network access using environment-appropriate controls. The project status page also recommends considering mandatory access controls such as AppArmor or SELinux: wkhtmltopdf status.
Do not concatenate user input into a shell command. Keep the executable fixed and pass inputs as arguments to execFile or spawn; Node warns that shell execution with unsanitized input can enable arbitrary command execution. If you provide an environment object to the child process, preserve the needed PATH when command lookup depends on it.
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The command documentation says JavaScript is enabled by default and lists a default JavaScript delay of 200 ms. A fixed delay does not prove that a dynamic application has finished rendering. You can adjust the delay or disable JavaScript with the documented flags, but verify the output rather than assuming a wait is sufficient.
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- Dynamic content: confirm required data is present in the output. The project suggests considering Puppeteer for sites that rely on dynamic JavaScript.
- Missing local assets: check local-file access settings and grant only the paths needed with
--allow. - Missing remote assets: check that the converter can reach the page’s CSS, images and fonts, and review load-error behavior.
- Layout differences: check fonts, print versus screen media styles, paper size, margins, and the converter build used in production.
- Large or slow pages: tune timeouts and process concurrency to the application, and ensure a timed-out request does not leave a converter running.
The usage manual documents load-error modes (abort, ignore or skip), media-load error handling, image disabling, print/screen media settings and local-file access controls. These are behavior controls, not guarantees of compatibility with contemporary browser features.
Troubleshoot common Node.js and conversion failures
| Symptom | Likely cause | What to check |
|---|---|---|
ENOENT or “command not found” |
The executable is not installed, or the Node process cannot find it on PATH. | Run wkhtmltopdf --version as the service user; set the correct PATH or use the binary’s actual absolute path. |
| Permission error | The process user cannot execute the binary or write the destination. | Check executable permissions and output-directory ownership; avoid running the service with unnecessary privileges. |
| Nonzero exit or missing/invalid PDF | Conversion failed, a resource could not load, or the page was incomplete. | Log the exit error and stderr safely; test the URL and assets from the production environment and inspect the selected load-error options. |
| Local CSS, images or fonts are absent | Local-file access is restricted, or the relevant paths were not permitted. | Use a controlled asset directory and narrowly grant it with --allow; verify with the exact binary. |
| Page content is blank or stale | JavaScript-dependent content did not finish before capture, or the delay is inadequate. | Check whether the content requires JavaScript, test an appropriate delay, and consider a renderer intended for dynamic pages. |
| Conversion hangs or is killed | A slow page, unreachable resource or runaway conversion exceeded operational limits. | Set a timeout, handle cancellation, and prevent abandoned child processes from continuing. |
| Behavior differs between development and production | Different binary builds, fonts, architecture, permissions or resource access. | Compare the actual binary version and environment, then test using the production image and service account. |
Check whether wkhtmltopdf fits the project
The project’s download page lists 0.12.6 as its stable series, released June 11, 2020. Its status page notes that Qt 4 has been unsupported since 2015 and that its WebKit version had not been updated since 2012. Treat compatibility and maintenance as deployment questions to verify, rather than assuming a planned project direction has shipped.
The project recommends considering WeasyPrint or commercial Prince for reports generated from HTML under your control, and Puppeteer for sites using dynamic JavaScript. Those are project recommendations, not comparative benchmarks. Evaluate output fidelity for your templates, JavaScript completion, security maintenance, dependencies and fonts, current platform support, and licensing or commercial terms before switching: project status and alternatives.
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Frequently Asked Questions
Does the npm wkhtmltopdf package include wkhtmltopdf?
No. It is a Node.js wrapper; install the command-line executable separately.
Can wkhtmltopdf render JavaScript?
It has JavaScript enabled by default, but its documented default delay is 200 ms and that does not guarantee a dynamic page has finished rendering.
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