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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteInstall PhantomJS in GitLab CI by selecting a Node image with a working shell, installing Linux Fontconfig, running npm ci from a committed lockfile, and invoking ./node_modules/.bin/phantomjs from your job script. The npm package downloads a platform-specific binary, so network access, PATH, permissions and runner architecture determine whether installation succeeds. PhantomJS is a legacy choice: GitLab reported switching its own tests to headless Chrome in 2017, so use this setup when an existing suite still depends on PhantomJS and evaluate a modern browser runner for new work.
What the GitLab CI job needs
A GitLab job runs its script commands inside the image selected by image. With the Docker executor, that image is an isolated container, so it must contain a usable shell and the tools your commands call.
- A pinned Node-based image, such as
node:20-bookworm. - Your project’s
package.jsonand committedpackage-lock.json. - The
phantomjsnpm package as a development dependency. - Fontconfig in Linux images. The PhantomJS package notes that Qt and WebKit do not need separate installation, but Fontconfig is still required.
- Runner network access to download the package’s prebuilt binary, unless you provide an approved mirror or a PhantomJS executable on
PATH.
Prepare a minimal PhantomJS project
Install and lock the dependency
Run this locally with the Node and npm versions used by your project:
npm install --save-dev phantomjsCommit both package.json and package-lock.json. The lockfile records the dependency tree that CI should reproduce; do not rely on a fresh, uncommitted install.
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Create a small page runner
This example opens a URL supplied as the first argument and returns a nonzero exit code when the page cannot be opened. Replace it with your existing test harness if you already have one.
var system = require('system');
var page = require('webpage').create();
var url = system.args[1] || 'https://example.com';
page.open(url, function (status) {
if (status !== 'success') {
console.error('Unable to open ' + url + ': ' + status);
phantom.exit(1);
return;
}
console.log('Opened ' + url);
phantom.exit(0);
});Save it as test/runner.js. Calling the binary through ./node_modules/.bin/phantomjs ensures the job uses the version installed for this project rather than an unrelated system executable.
Use a reproducible .gitlab-ci.yml
The following job follows the legacy pattern: install Fontconfig, perform a clean lockfile install, then invoke PhantomJS from the project.
image: node:20-bookworm
stages:
- test
phantomjs_test:
stage: test
before_script:
- apt-get update
- apt-get install -y --no-install-recommends fontconfig
- rm -rf /var/lib/apt/lists/*
- npm ci
script:
- ./node_modules/.bin/phantomjs test/runner.js https://example.comIf your organization maintains a custom image, install Fontconfig in that image instead of running apt-get on every job. The important properties are the same: a working shell, Node, the archive tool used by the installer, Fontconfig, and a writable npm installation and cache location.
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npm documents npm ci as a clean lockfile installation. It removes the existing dependency directory and installs the versions recorded in the lockfile, failing rather than silently rewriting it. If you created the lockfile with options that change dependency-tree shape, such as a peer-dependency mode, use the same options in CI. A mismatch can make a locally successful install fail in the runner.
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How the PhantomJS npm installer finds its binary
Platform and architecture detection
The npm package downloads a prebuilt PhantomJS binary for the detected operating system. When the runner’s platform or architecture is unusual, set PHANTOMJS_PLATFORM and PHANTOMJS_ARCH explicitly. You can also place an approved PhantomJS binary on PATH; the package can use that executable instead of downloading one.
Linux Fontconfig
Fontconfig is a runtime requirement on Linux. A job can complete npm ci and still fail when PhantomJS starts if the image lacks it. Install the package in the image, or choose an image that already includes it, before invoking the test.
Download mirrors and proxies
Binary download failures usually indicate a network path problem rather than a test failure. Configure an approved internal mirror, or supply a binary on PATH, when outbound downloads are restricted. Do not make strict-ssl=false a routine workaround: the package documentation describes it as risky for intercepting proxies. Install and trust the proxy’s certificate chain or use the approved mirror instead.
Make cross-platform runs predictable
Native binaries are platform-specific. If dependencies were produced on a different operating system or architecture, run npm rebuild in the target environment as described by the package documentation, then regenerate and commit the lockfile only when the dependency graph actually changes. The safest normal path is to create the lockfile with the same family of Node image used in CI and let npm ci install it without modification.
Troubleshoot installation and startup failures
spawn ENOENT
This means the process launcher cannot find a required executable. Check that both node and tar are on PATH inside the selected image. Confirm the job is calling ./node_modules/.bin/phantomjs after npm ci, not a path that exists only on your workstation.
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- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
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Permission denied while installing
The CI user must be able to write the npm cache, the project directory and the dependency installation directory. Use an image and runner user with matching ownership, or point npm’s cache at a writable location. Avoid changing permissions broadly across the container when fixing one directory.
ECONNRESET or ETIMEDOUT during npm ci
The installer could not download the PhantomJS binary. Verify DNS, proxy and firewall rules from the runner, then use an approved mirror or put a compatible binary on PATH. Retrying the same job without fixing the network path is not a reproducibility strategy.
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PhantomJS starts and immediately fails on Linux
Install Fontconfig and rerun the job. If it is already present, check that the package is available to the same user and image layer that runs the test.
Dependencies work locally but not in CI
Check for a lockfile generated on another platform, architecture or npm configuration. Run npm rebuild in the CI environment when required by the package documentation, and ensure CI uses the dependency-tree flags used to create the lockfile.
The job fails before script starts
The selected image may not provide a working shell, or the runner may not support the image’s execution model. GitLab’s Docker executor expects an image in which it can run the job shell. Test the image with a trivial job that prints the Node and npm versions before adding PhantomJS.
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Operational and security considerations
Keep the legacy surface isolated
Put PhantomJS jobs in their own stage or job so a future migration can replace the runner without changing unrelated pipelines. Pass the target URL or test selection as a variable rather than editing the script for every environment, and keep secrets out of command-line output.
Expect network-dependent setup
Unless the binary is already on PATH or available through an approved mirror, each clean installation depends on the package download completing. Record the image, Node version, npm configuration and lockfile revision with the pipeline so a failed run can be reproduced.
PhantomJS versus a modern browser runner
GitLab wrote in 2017 that it had switched from PhantomJS to headless Chrome for frontend and RSpec feature tests. The same report said PhantomJS had been part of GitLab’s test framework for “almost five years” at that time. Those statements are historical context, not a current GitLab support guarantee.
Before investing in more PhantomJS-specific CI work, compare the legacy suite and a modern runner on these axes:
| Decision axis | Questions to answer |
|---|---|
| JavaScript and web-platform compatibility | Does the browser implement the APIs and rendering behavior used by the application? |
| Binary and image availability | Can the required browser be installed reliably for the runner’s operating system and architecture? |
| Diagnostics | Will failures provide useful logs, screenshots, console output and network information? |
| Startup and reproducibility | Can the team pin the image and dependencies without relying on an unreliable download? |
| Migration effort | How much page script, selector logic and assertion code must be rewritten? |
If compatibility, diagnostics or binary availability are already limiting PhantomJS, treat the job above as a containment setup while you plan migration rather than as a new long-term standard.
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Runbook checklist
- Pin the Node image used by the job.
- Commit
package.jsonandpackage-lock.json. - Install Fontconfig in the Linux image.
- Verify Node and
tarare onPATH. - Run
npm ciwith the same dependency-tree options used to create the lockfile. - Invoke
./node_modules/.bin/phantomjsfrom the job. - For restricted networks, configure an approved mirror or provide a binary on
PATH. - For cross-platform dependency artifacts, run
npm rebuildin the target environment. - Keep TLS verification enabled unless your security team has documented a trusted certificate solution.
Or skip the browser setup
If your goal is to capture a rendered page rather than execute PhantomJS assertions, ScreenshotNeo provides a website screenshot API and MCP server. One request returns a PNG, JPEG, WebP or PDF. It accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups and chat widgets; each step can be turned off.
Only clean shots are billed. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads and cache hits cost nothing, and the response identifies the result with X-Page-Verdict and X-Billed headers. An MCP server exposes take_screenshot, get_page_info and capture_pdf to Claude, Cursor and other MCP clients.
Use the ScreenshotNeo API documentation for authentication and options. The following calls are runnable examples.
cURL
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`${res.status} ${res.statusText}`);
const buffer = Buffer.from(await res.arrayBuffer());
require('fs').writeFileSync('shot.webp', buffer);ScreenshotNeo includes full-page capture with lazy images loaded, CSS-selector element capture, dark mode, device presets and custom viewports, retina scale, PDF paper and page-range controls, custom CSS and JavaScript, clicks before capture, selector waits, delays or network-idle waits, request and resource blocking, custom headers, cookies, user agents, Authorization, timezone and geolocation, transparent backgrounds, resizing, configurable caching TTLs, signed image links, asynchronous jobs with signed webhooks, bulk capture for up to 100 URLs per call, a usage API and an OpenAPI specification. Common parameter names used by other screenshot APIs also work.
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Frequently Asked Questions
Can ScreenshotNeo run my PhantomJS test scripts?
No. ScreenshotNeo is a screenshot, page-information and PDF service; keep PhantomJS or another browser runner for DOM assertions and scripted tests.
Is the GitLab migration to headless Chrome a current compatibility promise?
No. GitLab’s statement was published in 2017 and should be treated as historical context, not a guarantee about today’s runners or support policies.
What should I preserve when moving this job to another runner architecture?
Preserve the lockfile, verify the target image has Node, tar, a shell and Fontconfig, and rebuild dependencies in the target environment when they were created on a different platform.
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