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Audits node_modules for package licenses. Uses bash to resolve SPDX IDs without reading file contents into context. LLM inference is a last resort for a small residual set.
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| name | license-checker |
| description | Audits node_modules for package licenses. Uses bash to resolve SPDX IDs without reading file contents into context. LLM inference is a last resort for a small residual set. |
| author | DigitalSpeed |
Scan all packages in node_modules and produce a license compliance report. Never read raw file contents into context — use bash to pattern-match first; only buffer the irreducible unknown set.
Step 1 — Bulk resolve (single bash call, handles scoped packages, zero file reads in context):
SPDX='MIT|ISC|BSD-[0-9]+-Clause|Apache-2\.0|GPL-[23]\.0(-only|-or-later)?|LGPL-[23]\.0|AGPL-3\.0|MPL-2\.0|Unlicense|CC0-1\.0|CDDL-1\.[01]|EPL-[12]\.0|EUPL-1\.[12]'
find node_modules -mindepth 2 -maxdepth 3 -name 'package.json' \
! -path '*/.bin/*' ! -path '*/node_modules/*/node_modules/*' | while read pjson; do
dir=$(dirname "$pjson")
row=$(jq -r '[.name, .version, (.license // (.licenses | if type=="array" then map(.type//"") | join(" OR ") else (.//"") end) // ""), (.repository.url // .repository // "")] | @tsv' "$pjson" 2>/dev/null)
lic=$(printf '%s' "$row" | cut -f3)
if [ -z "$lic" ]; then
lfile=$(find "$dir" -maxdepth 1 \( -iname 'license*' -o -iname 'licence*' -o -iname 'copying*' \) 2>/dev/null | head -1)
match=$(grep -iom1 -E "$SPDX" "$lfile" 2>/dev/null | head -1)
if [ -n "$match" ]; then
printf '%s\t%s*\tgrep\n' "$(printf '%s' "$row" | cut -f1-2,4)" "$match"
else
printf '%s\tUNKNOWN\t—\n' "$(printf '%s' "$row" | cut -f1-2,4)"
fi
else
printf '%s\tpackage.json\n' "$row"
fi
done
Output is TSV: name version license repository. Rows where license is UNKNOWN proceed to step 2.
Step 2 — LLM inference for residual unknowns only:
For each UNKNOWN package, read the first 500 chars of its license file (or README if absent). Apply:
SPDX ID only. Append * if inferred from file (not package.json). Text:
[500-char buffer]
Step 3 — Render report using the format in §2.
Tree format sorted alphabetically by name@version. An * suffix on a license means it was inferred from a file, not package.json.
├─ lodash@4.17.21
│ ├─ repository: https://github.com/lodash/lodash
│ └─ licenses: MIT
├─ some-lib@1.2.0
│ ├─ repository: https://github.com/some/lib
│ └─ licenses: GPL-3.0*
└─ ghost-pkg@1.0.0
└─ licenses: UNKNOWN
Omit the repository line if the field is empty. Use ├─ for all entries except the last, which uses └─. Sub-fields always use │ ├─ / │ └─ (or ├─ / └─ under a └─ parent).
Summary line after the tree:
Scanned: N | Confirmed: N | Inferred (*): N | Unknown: N
⚠️ Copyleft: [packages with GPL / LGPL / AGPL / MPL / EUPL licenses]