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What does npm audit check?
npm audit sends dependency information for the project’s dependency tree to its configured registry and reports known vulnerability advisories that match. Its documented scope includes dependencies, devDependencies, bundledDependencies, and optionalDependencies, but not peerDependencies. See npm’s audit command reference and guide to auditing package dependencies.
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The result is only as broad as the advisory data available to the configured registry and the dependency tree submitted. It is not a malware detector, does not establish whether a package is trustworthy, and cannot certify that the application is safe. A suspicious package may have no known advisory at all.
How do you run a repeatable audit?
1. Start in the project with its lockfile
Run the commands from the directory containing the project’s package.json and package-lock.json or npm shrinkwrap file. npm requires a lockfile for an audit by default. Auditing without one can require npm to reconstruct the dependency tree, so results may differ between runs as dependency resolution changes. The lockfile makes the audited tree more reproducible.
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2. Generate a read-only report
Run npm audit first. To retain or process a machine-readable report, run npm audit --json. The audit reports findings; it does not itself install remediation. For command behavior and options, consult the npm CLI reference.
3. Triage each finding in context
For every result, examine the package name and affected version, severity, advisory details, dependency path, and proposed fix. Then determine whether the affected conditions apply to how your application actually uses the package. A package may be nested several levels down, so follow the reported path rather than assuming it is a direct dependency. Some findings require manual intervention; a suggested fix is not a guarantee that an automatic or compatible remedy exists.
How do you fix npm audit vulnerabilities?
Use automatic fixes as a proposed change, not a verdict
npm audit fix applies compatible remediations when available. npm notes that it runs a full installation under the hood, so it can change the dependency tree and lockfile. Review the resulting changes, run the project’s tests, and verify that the update resolves the relevant finding without breaking compatibility.
Handle major or forced updates deliberately
If the proposed remediation requires a major-version change or a forced change outside normal compatibility constraints, assess it as a dependency upgrade—not as a routine security patch. Check release notes and compatibility requirements, plan any needed code changes, and test before merging. Do not use a force option simply to make the report disappear.
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Make recurring checks meaningful in CI
npm recommends running audits regularly or adding npm audit to continuous integration because advisory data can change. The --audit-level option sets the minimum severity that makes the command exit with a failing status; it changes the failure threshold, not which findings appear in the report. Choose a threshold that fits the team’s response policy, and ensure someone reviews findings below it as well. See the npm auditing guide.
How can you tell whether an npm package is suspicious?
Known-vulnerability scanning and package-trust review answer different questions. npm identifies threat patterns including typosquatting or dependency confusion, account takeover, and malicious changes to an existing package. None has a single deterministic test. Investigate a package when its identity, release, or origin does not fit the dependency you intended to install. npm describes these threat patterns in its threats and mitigations guidance.
- Check the name and scope. Compare the declared dependency name with the intended package, including spelling and whether it is scoped. For private package names, npm recommends scoped packages to reduce confusion risks.
- Review repository, maintainer, and release context. Look for changes that do not fit the package’s stated purpose, an unexpected repository or ownership change, or a release that warrants closer inspection. These are investigative signals, not proof of malice.
- Inspect source and behavior. Review what the package does and the code it runs, especially installation-related behavior and access to sensitive data or system resources. A passing vulnerability audit does not perform this review.
- Check available provenance links. When present, inspect the source repository and build information attached to the package. Provenance can help connect a published package to its source and build process, but does not establish that the code is benign.
What do npm signatures and provenance add?
After installing dependencies, npm audit signatures checks registry signatures and provenance attestations. Registry signatures provide evidence that package content matches what the registry signed; npm’s documentation explains their role in detecting tampered content in its registry-signature background. Provenance adds information about a package’s source and build. These checks strengthen integrity and origin review; neither replaces examining package behavior.
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npm’s documentation says provenance verification requires npm CLI 9.5.0 or later and dependencies installed with npm install or npm ci. Check the current command documentation and your installed CLI’s requirements, because npm advises using a current CLI and these features can change. npm’s provenance documentation is explicit: “When a package in the npm registry has established provenance, it does not guarantee the package has no malicious code.”
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How should you compare audit tools or reports?
If you evaluate another scanner alongside npm, compare what it actually covers rather than treating a larger report as automatically more accurate. Useful questions include:
- Does it include peer dependencies as well as the categories npm audits?
- Which advisory sources does it use, and how often is that data updated?
- Does it audit the lockfile or resolve a potentially different dependency tree?
- Can it run in CI, and can you configure failure thresholds without hiding lower-severity results?
- Are proposed remediations compatible, and what changes would they make to the dependency tree?
- Does it expose registry-signature or provenance evidence, or only vulnerability advisories?
These dimensions help define coverage and workflow; they do not establish that any third-party scanner performs better than npm for a particular project.
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