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If BackstopJS reports “Failed to launch chrome!”, first identify the exact Chrome error and the environment running the test. The fix is different for a missing browser download, a bad executable path, missing Linux libraries, sandbox restrictions, and unwritable container paths. Work through the checks below in that order; do not add --no-sandbox unless the error and runtime call for it.
Start with the full error and the actual runtime
BackstopJS uses Puppeteer for its Chrome headless engine, but “Chrome cannot launch” is a symptom, not a diagnosis. Copy the complete error and nearby stderr output, then check which BackstopJS and Puppeteer versions the project uses, which engine its configuration selects, and where the test runs (local machine, CI runner, or container).
This matters because configuration advice can be version-specific: BackstopJS documents --no-sandbox for a Docker scenario involving configurations generated before BackstopJS 3.5, not as a requirement for every current configuration. Compare your project’s versions and setup with the current BackstopJS README before applying an older example.
Fix “Could not find Chrome (ver. …)” or “spawn … ENOENT”
These messages usually mean the expected browser is missing from the environment, or that the configured executable path does not exist there. A browser installed on your laptop does not necessarily exist in the CI image or container that runs BackstopJS.
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- Check whether Puppeteer’s browser download was skipped. Puppeteer normally downloads a compatible Chrome for Testing during installation. Package managers or project configuration that block dependency install scripts can prevent that download.
- Install the browser in the test environment. From the project environment, run
npx puppeteer browsers install. Alternatively, configure the package manager to allow Puppeteer’s install script, then reinstall dependencies. See Puppeteer installation guidance. - Verify the path where BackstopJS runs. If you use a separately installed Chrome, confirm its executable path inside the runner or container and set an explicit path only if your selected engine supports it. Correct the path or install Chrome into that runtime if it is absent.
Puppeteer guarantees compatibility with the browser it downloads; when you point it at a separately managed browser, you are responsible for that browser’s availability and compatibility. Avoid assuming a path from a developer machine will also work in CI.
Fix Linux startup failures caused by missing libraries
If Chrome exists but exits immediately on Linux, inspect its shared-library dependencies on the same machine or inside the same container that runs the test:
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ldd <path-to-chrome> | grep not
Any reported missing libraries need to be installed using packages appropriate to your distribution, release, and browser build. Fonts can also matter for browser rendering. Do not copy a dependency list intended for one Debian or Ubuntu release into a different image without checking whether its packages apply. Use Puppeteer’s troubleshooting guide and the relevant distribution’s package metadata to determine what to install.
Handle “Running as root without –no-sandbox is not supported”
This message points to Chrome’s sandbox and the user or container context. Prefer a non-root browser process with the permissions and container capabilities needed to keep the sandbox enabled. Puppeteer’s official Docker guide says its image is intended to run Chrome in sandbox mode and therefore requires the SYS_ADMIN capability; it also calls for an init process to manage browser child processes. Follow the guide for the image and deployment you use: Puppeteer Docker guide.
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For the older BackstopJS Docker configuration case documented in its README, the engine option is:
{
"engineOptions": {
"args": ["--no-sandbox"]
}
}Use that only when the execution environment requires it and the error matches. Disabling the sandbox changes Chrome’s security posture; it is not a general fix for a missing executable, a dependency error, or a failed page load.
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Choose the container approach deliberately
| Approach | Security and permissions | Maintenance trade-off |
|---|---|---|
| Run Chrome as a non-root user with sandboxing enabled | Preserves the browser sandbox, but the container must provide the required permissions and capabilities. | Requires configuring the user, permissions, capability, and process management correctly. |
Use --no-sandbox for the matching constrained case |
Disables Chrome’s sandbox; use only where the environment requires it and the specific error supports it. | May be simpler in a constrained setup, but carries a security trade-off and should not be treated as a universal default. |
Fix crashpad errors and read-only container paths
Chrome needs writable locations for profile, cache, and configuration data during startup. In a read-only or restricted container, provide writable locations for its runtime files, such as paths under /tmp, or mount writable volumes owned by the browser process.
If you see chrome_crashpad_handler: --database is required, check whether Chrome can write its profile and configuration directories. Set the relevant XDG config/cache paths and Puppeteer user-data directory to writable locations, then rerun the test. Puppeteer lists this symptom and related environment checks in its troubleshooting guide.
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- Storage: 16 GB Flash Memory
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Separate a Docker URL problem from a Chrome launch problem
Once Chrome launches, a test can still fail because its target page is unreachable. In a container, localhost refers to that container, not automatically to the host machine or another service. For applicable Mac and Windows Docker setups, the BackstopJS README suggests host.docker.internal. Treat an unreachable URL as a connectivity or test-target issue, rather than a browser-binary launch failure.
Quick error-to-cause map
| Error clue | Check first | Next action |
|---|---|---|
Could not find Chrome (ver. ...) |
Was Puppeteer’s browser download skipped, or does the runner use a different cache or path? | Run npx puppeteer browsers install in the runner, or allow Puppeteer’s install script; verify the browser is present there. |
spawn ... ENOENT |
Does the configured executable path exist in the runtime? | Install the browser in that image or correct the path. |
Missing .so or ldd ... not found |
Are Linux shared libraries missing? | Install distribution-appropriate dependencies and inspect again with ldd. |
Running as root without --no-sandbox is not supported |
Is Chrome running as root without a suitable sandbox setup? | Prefer non-root sandboxed execution; use BackstopJS’s documented argument only for the matching constrained case. |
chrome_crashpad_handler: --database is required |
Can Chrome write its profile, cache, and configuration paths? | Provide writable XDG and user-data directories or writable mounts. |
Or skip the browser setup
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Frequently Asked Questions
Does `–no-sandbox` fix every BackstopJS Chrome launch error?
No. It addresses a specific sandbox constraint and should not be used to fix missing browsers, bad paths, missing libraries, or page connectivity failures.
Why does Chrome work locally but fail in CI?
The CI runner may have skipped Puppeteer’s browser download, use a different executable path or cache, lack Linux libraries, or restrict writable directories and sandbox permissions.
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