Table of contents
npm-audit
Select CLI Version:
Table of contents
Synopsis
npm audit [fix|signatures]
Description
The audit command submits a description of the dependencies configured in your project to your default registry and asks for a report of known vulnerabilities. If any vulnerabilities are found, then the impact and appropriate remediation will be calculated. If the fix
argument is provided, then remediations will be applied to the package tree.
The command will exit with a 0 exit code if no vulnerabilities were found.
Note that some vulnerabilities cannot be fixed automatically and will require manual intervention or review. Also note that since npm audit fix
runs a full-fledged npm install
under the hood, all configs that apply to the installer will also apply to npm install
-- so things like npm audit fix --package-lock-only
will work as expected.
By default, the audit command will exit with a non-zero code if any vulnerability is found. It may be useful in CI environments to include the --audit-level
parameter to specify the minimum vulnerability level that will cause the command to fail. This option does not filter the report output, it simply changes the command's failure threshold.
Package lock
By default npm requires a package-lock or shrinkwrap in order to run the audit. You can bypass the package lock with --no-package-lock
but be aware the results may be different with every run, since npm will re-build the dependency tree each time.
Audit Signatures
To ensure the integrity of packages you download from the public npm registry, or any registry that supports signatures, you can verify the registry signatures of downloaded packages using the npm CLI.
Registry signatures can be verified using the following audit
command:
$ npm audit signatures
The audit signatures
command will also verify the provenance attestations of downloaded packages. Because provenance attestations are such a new feature, security features may be added to (or changed in) the attestation format over time. To ensure that you're always able to verify attestation signatures check that you're running the latest version of the npm CLI. Please note this often means updating npm beyond the version that ships with Node.js.
The npm CLI supports registry signatures and signing keys provided by any registry if the following conventions are followed:
- Signatures are provided in the package's
packument
in each published version within thedist
object:
"dist":{"..omitted..": "..omitted..","signatures": [{"keyid": "SHA256:{{SHA256_PUBLIC_KEY}}","sig": "a312b9c3cb4a1b693e8ebac5ee1ca9cc01f2661c14391917dcb111517f72370809..."}]}
See this example of a signed package from the public npm registry.
The sig
is generated using the following template: ${package.name}@${package.version}:${package.dist.integrity}
and the keyid
has to match one of the public signing keys below.
- Public signing keys are provided at
registry-host.tld/-/npm/v1/keys
in the following format:
{"keys": [{"expires": null,"keyid": "SHA256:{{SHA256_PUBLIC_KEY}}","keytype": "ecdsa-sha2-nistp256","scheme": "ecdsa-sha2-nistp256","key": "{{B64_PUBLIC_KEY}}"}]}
Keys response:
expires
: null or a simplified extended ISO 8601 format:YYYY-MM-DDTHH:mm:ss.sssZ
keydid
: sha256 fingerprint of the public keykeytype
: onlyecdsa-sha2-nistp256
is currently supported by the npm CLIscheme
: onlyecdsa-sha2-nistp256
is currently supported by the npm CLIkey
: base64 encoded public key
See this example key's response from the public npm registry.
Audit Endpoints
There are two audit endpoints that npm may use to fetch vulnerability information: the Bulk Advisory
endpoint and the Quick Audit
endpoint.
Bulk Advisory Endpoint
As of version 7, npm uses the much faster Bulk Advisory
endpoint to optimize the speed of calculating audit results.
npm will generate a JSON payload with the name and list of versions of each package in the tree, and POST it to the default configured registry at the path /-/npm/v1/security/advisories/bulk
.
Any packages in the tree that do not have a version
field in their package.json file will be ignored. If any --omit
options are specified (either via the --omit
config, or one of the shorthands such as --production
, -->, and so on), then packages will be omitted from the submitted payload as appropriate.
If the registry responds with an error, or with an invalid response, then npm will attempt to load advisory data from the Quick Audit
endpoint.
The expected result will contain a set of advisory objects for each dependency that matches the advisory range. Each advisory object contains a name
, url
, id
, severity
, vulnerable_versions
, and title
.
npm then uses these advisory objects to calculate vulnerabilities and meta-vulnerabilities of the dependencies within the tree.
Quick Audit Endpoint
If the Bulk Advisory
endpoint returns an error, or invalid data, npm will attempt to load advisory data from the Quick Audit
endpoint, which is considerably slower in most cases.
The full package tree as found in package-lock.json
is submitted, along with the following pieces of additional metadata:
npm_version
node_version
platform
arch
node_env
All packages in the tree are submitted to the Quick Audit endpoint. Omitted dependency types are skipped when generating the report.
Scrubbing
Out of an abundance of caution, npm versions 5 and 6 would "scrub" any packages from the submitted report if their name contained a /
character, so as to avoid leaking the names of potentially private packages or git URLs.
However, in practice, this resulted in audits often failing to properly detect meta-vulnerabilities, because the tree would appear to be invalid due to missing dependencies, and prevented the detection of vulnerabilities in package trees that used git dependencies or private modules.
This scrubbing has been removed from npm as of version 7.
Calculating Meta-Vulnerabilities and Remediations
npm uses the @npmcli/metavuln-calculator
module to turn a set of security advisories into a set of "vulnerability" objects. A "meta-vulnerability" is a dependency that is vulnerable by virtue of dependence on vulnerable versions of a vulnerable package.
For example, if the package foo
is vulnerable in the range >=1.0.2 <2.0.0
, and the package bar
depends on foo@^1.1.0
, then that version of bar
can only be installed by installing a vulnerable version of foo
. In this case, bar
is a "metavulnerability".
Once metavulnerabilities for a given package are calculated, they are cached in the ~/.npm
folder and only re-evaluated if the advisory range changes, or a new version of the package is published (in which case, the new version is checked for metavulnerable status as well).
If the chain of metavulnerabilities extends all the way to the root project, and it cannot be updated without changing its dependency ranges, then npm audit fix
will require the --force
option to apply the remediation. If remediations do not require changes to the dependency ranges, then all vulnerable packages will be updated to a version that does not have an advisory or metavulnerability posted against it.
Exit Code
The npm audit
command will exit with a 0 exit code if no vulnerabilities were found. The npm audit fix
command will exit with 0 exit code if no vulnerabilities are found or if the remediation is able to successfully fix all vulnerabilities.
If vulnerabilities were found the exit code will depend on the audit-level
config.
Examples
Scan your project for vulnerabilities and automatically install any compatible updates to vulnerable dependencies:
$ npm audit fix
Run audit fix
without modifying node_modules
, but still updating the pkglock:
$ npm audit fix --package-lock-only
Skip updating devDependencies
:
$ npm audit fix --only=prod
Have audit fix
install SemVer-major updates to toplevel dependencies, not just SemVer-compatible ones:
$ npm audit fix --force
Do a dry run to get an idea of what audit fix
will do, and also output install information in JSON format:
$ npm audit fix --dry-run --json
Scan your project for vulnerabilities and just show the details, without fixing anything:
$ npm audit
Get the detailed audit report in JSON format:
$ npm audit --json
Fail an audit only if the results include a vulnerability with a level of moderate or higher:
$ npm audit --audit-level=moderate
Configuration
audit-level
- Default: null
- Type: null, "info", "low", "moderate", "high", "critical", or "none"
The minimum level of vulnerability for npm audit
to exit with a non-zero exit code.
dry-run
- Default: false
- Type: Boolean
Indicates that you don't want npm to make any changes and that it should only report what it would have done. This can be passed into any of the commands that modify your local installation, eg, install
, update
, dedupe
, uninstall
, as well as pack
and publish
.
Note: This is NOT honored by other network related commands, eg dist-tags
, owner
, etc.
force
- Default: false
- Type: Boolean
Removes various protections against unfortunate side effects, common mistakes, unnecessary performance degradation, and malicious input.
- Allow clobbering non-npm files in global installs.
- Allow the
npm version
command to work on an unclean git repository. - Allow deleting the cache folder with
npm cache clean
. - Allow installing packages that have an
engines
declaration requiring a different version of npm. - Allow installing packages that have an
engines
declaration requiring a different version ofnode
, even if--engine-strict
is enabled. - Allow
npm audit fix
to install modules outside your stated dependency range (including SemVer-major changes). - Allow unpublishing all versions of a published package.
- Allow conflicting peerDependencies to be installed in the root project.
- Implicitly set
--yes
duringnpm init
. - Allow clobbering existing values in
npm pkg
- Allow unpublishing of entire packages (not just a single version).
If you don't have a clear idea of what you want to do, it is strongly recommended that you do not use this option!
json
- Default: false
- Type: Boolean
Whether or not to output JSON data, rather than the normal output.
- In
npm pkg set
it enables parsing set values with JSON.parse() before saving them to yourpackage.json
.
Not supported by all npm commands.
package-lock-only
- Default: false
- Type: Boolean
If set to true, the current operation will only use the package-lock.json
, ignoring node_modules
.
For update
this means only the package-lock.json
will be updated, instead of checking node_modules
and downloading dependencies.
For list
this means the output will be based on the tree described by the package-lock.json
, rather than the contents of node_modules
.
package-lock
- Default: true
- Type: Boolean
If set to false, then ignore package-lock.json
files when installing. This will also prevent writing package-lock.json
if save
is true.
omit
- Default: 'dev' if the
NODE_ENV
environment variable is set to 'production', otherwise empty. - Type: "dev", "optional", or "peer" (can be set multiple times)
Dependency types to omit from the installation tree on disk.
Note that these dependencies are still resolved and added to the package-lock.json
or npm-shrinkwrap.json
file. They are just not physically installed on disk.
If a package type appears in both the --include
and --omit
lists, then it will be included.
If the resulting omit list includes 'dev'
, then the NODE_ENV
environment variable will be set to 'production'
for all lifecycle scripts.
include
- Default:
- Type: "prod", "dev", "optional", or "peer" (can be set multiple times)
Option that allows for defining which types of dependencies to install.
This is the inverse of --omit=<type>
.
Dependency types specified in --include
will not be omitted, regardless of the order in which omit/include are specified on the command-line.
foreground-scripts
- Default:
false
unless when usingnpm pack
ornpm publish
where it defaults totrue
- Type: Boolean
Run all build scripts (ie, preinstall
, install
, and postinstall
) scripts for installed packages in the foreground process, sharing standard input, output, and error with the main npm process.
Note that this will generally make installs run slower, and be much noisier, but can be useful for debugging.
ignore-scripts
- Default: false
- Type: Boolean
If true, npm does not run scripts specified in package.json files.
Note that commands explicitly intended to run a particular script, such as npm start
, npm stop
, npm restart
, npm test
, and npm run-script
will still run their intended script if ignore-scripts
is set, but they will not run any pre- or post-scripts.
workspace
- Default:
- Type: String (can be set multiple times)
Enable running a command in the context of the configured workspaces of the current project while filtering by running only the workspaces defined by this configuration option.
Valid values for the workspace
config are either:
- Workspace names
- Path to a workspace directory
- Path to a parent workspace directory (will result in selecting all workspaces within that folder)
When set for the npm init
command, this may be set to the folder of a workspace which does not yet exist, to create the folder and set it up as a brand new workspace within the project.
This value is not exported to the environment for child processes.
workspaces
- Default: null
- Type: null or Boolean
Set to true to run the command in the context of all configured workspaces.
Explicitly setting this to false will cause commands like install
to ignore workspaces altogether. When not set explicitly:
- Commands that operate on the
node_modules
tree (install, update, etc.) will link workspaces into thenode_modules
folder. - Commands that do other things (test, exec, publish, etc.) will operate on the root project, unless one or more workspaces are specified in theworkspace
config.
This value is not exported to the environment for child processes.
include-workspace-root
- Default: false
- Type: Boolean
Include the workspace root when workspaces are enabled for a command.
When false, specifying individual workspaces via the workspace
config, or all workspaces via the workspaces
flag, will cause npm to operate only on the specified workspaces, and not on the root project.
This value is not exported to the environment for child processes.
install-links
- Default: false
- Type: Boolean
When set file: protocol dependencies will be packed and installed as regular dependencies instead of creating a symlink. This option has no effect on workspaces.