CycloneDX SBOM for npm

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Create CycloneDX Software Bill of Materials (SBOM) from npm projects.

Based on OWASP Software Component Verification Standard for Software Bill of Materials's criteria, this tool is capable of producing SBOM documents almost passing Level-2 (only signing needs to be done externally).

The resulting SBOM documents follow official specifications and standards, and might have properties following cdx:npm Namespace Taxonomy .

Requirements

• node >= 14
• npm in range 6 - 11

Installation

There are multiple methods for installing this tool:

• As a global tool ala npm:

  npm install --global @cyclonedx/cyclonedx-npm

• As a global tool ala npx:

  npx --package @cyclonedx/cyclonedx-npm --call exit

• As a development dependency of the current project:

  npm install --save-dev @cyclonedx/cyclonedx-npm

Usage

Depending on the installation method, the following describes the proper usage:

• If installed as a global tool ala npm:

  cyclonedx-npm --help

• If installed as a global tool ala npx:
  — or —
  If installed as a development dependency of the current projects:

  npx @cyclonedx/cyclonedx-npm --help

The help page:

Usage: cyclonedx-npm [options] [--] [<package-manifest>]

Create CycloneDX Software Bill of Materials (SBOM) from Node.js NPM projects.

Arguments:
  <package-manifest>        Path to project's manifest file.
                            (default: "package.json" file in current working directory)

Options:
  --ignore-npm-errors       Whether to ignore errors of NPM.
                            This might be used, if "npm install" was run with "--force" or "--legacy-peer-deps".
                            (default: false)
  --package-lock-only       Whether to only use the lock file, ignoring "node_modules".
                            This means the output will be based only on the few details in and the tree described by the "npm-shrinkwrap.json" or "package-lock.json", rather than the contents of "node_modules" directory.
                            (default: false)
  --omit <type...>          Dependency types to omit from the installation tree.
                            (can be set multiple times)
                            (choices: "dev", "optional", "peer", default: "dev" if the NODE_ENV environment variable is set to "production", otherwise empty)
  --gather-license-texts    Search for license files in components and include them as license evidence.
                            This feature is experimental. (default: false)
  --flatten-components      Whether to flatten the components.
                            This means the actual nesting of node packages is not represented in the SBOM result.
                            (default: false)
  --short-PURLs             Omit all qualifiers from PackageURLs.
                            This causes information loss in trade-off shorter PURLs, which might improve ingesting these strings.
                            (default: false)
  --spec-version <version>  Which version of CycloneDX spec to use.
                            (choices: "1.2", "1.3", "1.4", "1.5", "1.6", default: "1.4")
  --output-reproducible     Whether to go the extra mile and make the output reproducible.
                            This requires more resources, and might result in loss of time- and random-based-values.
                            (env: BOM_REPRODUCIBLE)
  --output-format <format>  Which output format to use.
                            (choices: "JSON", "XML", default: "JSON")
  --output-file <file>      Path to the output file.
                            Set to "-" to write to STDOUT.
                            (default: write to STDOUT)
  --validate                Validate resulting BOM before outputting.
                            Validation is skipped, if requirements not met. See the README.
  --no-validate             Disable validation of resulting BOM.
  --mc-type <type>          Type of the main component.
                            (choices: "application", "firmware", "library", default: "application")
  -v, --verbose             Increase the verbosity of messages.
                            Use multiple times to increase the verbosity even more.
  -V, --version             output the version number
  -h, --help                display help for command

Demo

For a demo of cyclonedx-npm see the demo project.

How it works

This tool utilizes npm to collect evidences of installed packages/modules. Read more in the dedicated docs.

The appropriate npm executable is detected automatically, yet can be overridden with the environment variable npm_execpath.
Autodetect: If called from npm/npx context, then the current npm executable is utilized, otherwise it is managed by SHELL and PATH.

This tool does not do artificial deduplication. Therefore, if a component is installed multiple times, it appears multiple times in the SBOM result. Read more on the topic in the dedicated docs "Component Deduplication".

Internals

This tool utilizes the CycloneDX library to generate the actual data structures, and serialize and validate them.
Validation requires transitive optional dependencies.

This tool does not expose any additional public API or classes - all code is intended to be internal and might change without any notice during version upgrades. However, the CLI is stable - you may call it programmatically like:

const { execFileSync } = require('child_process')
const { constants: { MAX_LENGTH: BUFFER_MAX_LENGTH } } = require('buffer')
const sbom = JSON.parse(execFileSync(process.execPath, [
    '../path/to/this/package/bin/cyclonedx-npm-cli.js',
    '--output-format', 'JSON',
    '--output-file', '-'
    // additional CLI args
], { stdio: ['ignore', 'pipe', 'ignore'], encoding: 'buffer', maxBuffer: BUFFER_MAX_LENGTH }))

Contributing

Feel free to open issues, bugreports or pull requests.
See the CONTRIBUTING file for details.

License

Permission to modify and redistribute is granted under the terms of the Apache 2.0 license.
See the LICENSE file for the full license.