Publish an npm package with provenance attestation (SLSA)
domain: docs.npmjs.com · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Ensure you are publishing from a GitHub Actions workflow (provenance requires a supported CI provider and the ability to link to the build).
Add the GitHub token to the workflow env: `env: NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}` and the GITHUB_TOKEN (auto-provided).
Run `npm publish --provenance` inside the workflow.
npm generates and uploads a SLSA provenance statement attesting the tarball was built from a specific repo/commit.
Verify the published package shows a 'provenance' badge/signature on npmjs.com and via the registry API.
Known gotchas
Provenance only works when the build environment can mint a signed OIDC token — running `--provenance` outside the supported CI (e.g. a bare shell) fails.
Two-factor authentication and a valid NODE_AUTH_TOKEN are still required in the CI publish step.
The provenance links the build's ref; the strongest guarantees come from publishing on a tag/branch push that has an associated signature.
If the OIDC/hosting provider is not recognized, the command errors and the publish does not proceed.
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