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Before adding an npm package, verify the exact name and version, compare its registry listing with its linked repository, and review its maintainers, release history, lifecycle scripts, and dependency tree. Then check for known vulnerabilities and verify signatures or provenance where available. These checks can uncover warning signs, but none—including a clean audit or valid provenance—proves that code is harmless.
Start by verifying the package you intend to install
Check the exact package name, scope, and version on the npm registry. A misspelling or confusingly similar name can point to a different package. Compare the registry page’s repository link with the project you expect, and confirm that the release you plan to use corresponds to that project.
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Do this for the specific version you intend to add, not just the package’s latest release. Releases can differ in their contents, scripts, and dependencies.
Review the project and the people behind it
Look at the publisher and maintainers, contributors, tagged releases, changelog, and recent repository activity. Check whether the release history and stated purpose make sense together, and whether the project provides a security contact or a SECURITY.md file. ENISA recommends reviewing maintainer metadata and project activity; verified publishers and valid provenance are useful signals, not proof of safety (ENISA Technical Advisory for Secure Use of Package Managers, version 1.1, March 2026).
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Investigate sudden changes in maintainership, unexplained release bursts, or a release whose contents do not match its changelog. These are reasons to pause and seek more evidence, not by themselves proof of malware.
Inspect install scripts before running npm install
Packages can run lifecycle scripts during installation. Review the package’s package.json, focusing especially on preinstall, install, and postinstall. Ask what each command does and whether it is necessary for the package’s stated purpose.
Be especially cautious if an install script downloads and executes code or binaries from an external URL. ENISA recommends inspecting scripts and advises against packages that use install scripts to download additional external code (ENISA advisory).
If something is unexplained or inconsistent, do not run the package to find out what it does on a workstation or CI runner containing secrets or sensitive data. If analysis is necessary, use a disposable, isolated environment with restricted credentials and network access.
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Understand what the package brings into your project
Review the package’s declared dependencies and whether they are plausible for its function. After installation, npm ls --all can show the dependency tree, as ENISA notes. A small-looking package may bring in a much larger dependency chain, so consider the added packages as well as the one you selected.
Run npm audit, but do not treat it as a malware scan
npm audit reports known vulnerabilities in dependencies represented in the project. npm describes the command as submitting a description of the project’s dependencies to the default registry and requesting a report of known vulnerabilities (npm audit CLI reference).
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According to npm’s audit documentation, coverage includes direct dependencies, devDependencies, bundled dependencies, and optional dependencies, but not peer dependencies. The report is about known vulnerabilities; it is not a general analysis of whether code is malicious. Review the findings rather than treating the command’s result as a safety verdict, and rerun audits regularly because advisory data can change (npm audit guide).
Check signatures and provenance when available
Run npm audit signatures to check registry signatures and provenance attestations for downloaded packages when available. A signature provides an integrity or authenticity signal for registry package data; provenance can provide evidence about where and how a package was built. Neither establishes that the package’s source code or build output is benign (npm audit CLI reference).
npm documents automatic provenance generation through trusted publishing under specified conditions involving OIDC, a public repository, and a public package. Its availability depends on those conditions; an attestation is evidence about origin and process, not a malware verdict (npm trusted publishing).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use malware alerts as another signal
GitHub Dependabot can alert on npm packages flagged as malicious in the GitHub Advisory Database. GitHub says detection can be incomplete or delayed, and only reviewed advisories trigger alerts. Therefore, a missing alert does not establish that a package is safe (GitHub Dependabot malware alerts).
What each check can—and cannot—tell you
| Check | Useful evidence | Limit |
|---|---|---|
npm audit |
Known vulnerability reports for covered dependencies. | Does not test for malicious intent; npm’s audit guide excludes peer dependencies. |
| Dependabot malware alerts | Known malicious packages flagged in the GitHub Advisory Database. | Coverage can lag or be incomplete; only reviewed advisories trigger alerts. |
| Registry signatures | Integrity or authenticity signal for registry-downloaded package data. | A signed package is not necessarily benign. |
| Provenance attestation | Evidence about build origin and process. | Does not establish that source code or build output is safe. |
| Source, maintainer, script, and release review | Context and suspicious behavior to investigate. | Manual review can miss obfuscated or delayed behavior. |
Account for npm’s publish-time scanning rollout
In a changelog dated July 28, 2026, GitHub said npm was introducing automatic package scanning at publish time, before packages become available for installation. Depending on scan results, a package may be published normally, held for manual review, or blocked. The announcement also describes disclosure and two-factor-authentication requirements for packages declaring dual-use content. This is a registry-side control with an evolving rollout and enforcement; it does not replace reviewing a specific package before installing it (GitHub changelog, July 28, 2026).
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If the registry listing and repository do not line up, a script is unexplained, or the release history raises questions you cannot resolve, do not add the package yet. Ask a trusted maintainer or security reviewer to assess it. Popularity, clean scanner results, and a valid provenance record can all help inform a decision, but none settles whether code is harmless.
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