npm-script-lens

Know what an install script actually does before you approve it.

The install-script-approval tool for npm · pnpm · yarn · bun — from your CLI, CI, editor, and AI agent.

Since npm v12 (July 8, 2026), dependency lifecycle scripts (preinstall, install, postinstall) and implicit node-gyp builds no longer run unless explicitly allowed via the allowScripts field in package.json. And npm isn't alone — pnpm (allowBuilds), yarn Berry (dependenciesMeta.built), and bun (trustedDependencies) all made install scripts opt-in too. That leaves every team, on every package manager, staring at a list of package names asking: which of these are safe to approve?

npm-script-lens answers that with evidence, not vibes — the review-report mode the community asked for in npm/rfcs#897. For every package in your lockfile — package-lock.json, npm-shrinkwrap.json, yarn.lock (classic and berry), pnpm-lock.yaml, or bun.lock — it:

fetches the version metadata from the public npm registry,
stream-downloads the tarball and indexes its source files (tar-stream, nothing written to disk) — skipped entirely for the majority of packages with no install-time scripts, which is why real audits take seconds,
statically analyzes each preinstall/install/postinstall script with acorn — including the JS the script actually runs: node <file> targets, node -e eval bodies, relative require()/import chains, path.join(__dirname, …) indirections, and npm run <target> recursion into the package's own scripts (3 levels deep, cycle-safe). Packages that ship a root binding.gyp with no install script get their implicit node-gyp rebuild surfaced too — npm v12 blocks those builds as well. (prepare is deliberately excluded: npm never runs it for registry-installed deps, and flagging leftover "prepare": "husky install" lines would be noise.)
scores the behavior and emits a Markdown report plus a ready-to-paste, version-pinned allowScripts block,
adds context to every risky package: how it entered your tree (via prisma → @prisma/engines), whether OSV lists it as malicious (⛔ hard flag, always denied), and publisher trust signals — publish age, weekly downloads, maintainer count, sigstore provenance — so "🔴 HIGH, 74M dl/wk, 10 years old" reads differently from "🔴 HIGH, published 4 days ago, 12 dl/wk".

Risk	Meaning
🔴 HIGH	spawns processes (`child_process`, `execa`, `node-gyp`, unresolved binaries) or runs constructed code (`eval`, `new Function`, `vm`, string-built `require()`, base64/char-code payload decoding)
🟠 MEDIUM	network access (`http(s).get/request`, `fetch`, `axios`/`got`/`node-fetch`/…) without exec
🟡 LOW	filesystem writes or `process.env` reads only
🟢 SAFE	none of the above

Results are cached on disk keyed name@version + tool version (published tarballs are immutable), so repeat audits are near-instant and fully offline. --no-cache opts out; NPM_SCRIPT_LENS_CACHE_DIR relocates the cache.

CLI

npx npm-script-lens audit --path ./my-project --fail-on-high
# --path PATH   project dir or lockfile: package-lock.json, npm-shrinkwrap.json,
#               yarn.lock, pnpm-lock.yaml, bun.lock (default: .)
# --json        machine-readable output
# --out FILE    write report to a file
# --sarif FILE  also write SARIF 2.1.0 for GitHub code scanning
# --html FILE   also write a self-contained, shareable HTML report
# --diff BASE   audit only packages added/upgraded vs a base lockfile
# --since REF   like --diff, but extract the base lockfile from a git ref
# --offline     analyze node_modules on disk instead of the registry
# --no-trust    skip OSV/downloads/provenance enrichment
# --no-cache    disable the on-disk result cache
# --fail-on-high  exit 1 if any package scores HIGH or is known malicious

Reviewing a PR? Audit only what changed — and see what upgrades gained:

npx npm-script-lens audit --since origin/main --fail-on-high   # base lockfile pulled from the ref for you
# …or point --diff at a base lockfile you extracted yourself:
git show origin/main:package-lock.json > /tmp/base-lock.json
npx npm-script-lens audit --diff /tmp/base-lock.json --fail-on-high

In diff mode, a package that was already in the tree but changed version is compared against the base version's analysis: **⚠️ gained vs 1.2.0:** net: fetch() is the fingerprint of a hijacked release (event-stream, the 2025 Shai-Hulud wave); no new capabilities vs 1.2.0 is a boring upgrade.

diff: what did an upgrade change in the install scripts?

Before you bump a pin, see exactly which install-time behavior a new version adds or changes — the surface npm v12 will ask you to re-approve. diff compares the preinstall/install/postinstall scripts (and the implicit node-gyp rebuild that ships with a root binding.gyp) between two versions, straight from the registry:

npx npm-script-lens diff [email protected] [email protected]
# --json   emit { unchanged, added, removed, modified } instead of colored text

[email protected] → [email protected]
REMOVED: implicit node-gyp rebuild (binding.gyp)
MODIFIED: install
    - (node install/libvips && node install/dll-copy && prebuild-install) || …
    + node install/check

UNCHANGED (green) — key present in both, byte-identical
ADDED (red) — a new script, or a gained binding.gyp → ADDED: implicit node-gyp rebuild (binding.gyp)
REMOVED (yellow) — a script that went away
MODIFIED (red) — same key, changed content, with a line-level diff

Exit 0 when everything is unchanged; exit 1 the moment any script is added or modified — so a Renovate/Dependabot CI step can fail the moment an upgrade grows its install-time surface. (A pure removal stays exit 0.)

review: see what you're approving, not just its name

npm v12's own pending list stops at the script command:

$ npm approve-scripts --allow-scripts-pending
[email protected]   install: node install/check

What's inside install/check? npm can't tell you — the #1 complaint in the v12 migration discussion. review picks up exactly where npm stops:

npx npm-script-lens review                        # show every pending approval with evidence
npx npm-script-lens review --output-allowscripts  # …and write the decisions into package.json

For each package awaiting an allowScripts decision it shows the script command, the first 40 lines of the actual file the command runs (from the version-pinned registry tarball — or node_modules with --offline), the behavioral scan verdict with signals, the OSV malware check, and publisher trust:

── [email protected]  [🔴 HIGH]
   1.9y old · 75M dl/wk · 1 maintainer · no provenance
   OSV: no known malicious advisories
   install: node install/check
     exec: node-gyp rebuild --directory=src
     exec: require('child_process')
   ┌─ install/check.js (first 40 of 42 lines)
   │   1  // Copyright 2013 Lovell Fuller and others.
   │   2  // SPDX-License-Identifier: Apache-2.0
   …

The pending set comes from your own npm when it can answer: with npm ≥ 12, review runs npm install --dry-run --json and reads its unreviewedScripts — so what you review is literally what npm would block, even before a lockfile exists. On npm < 12 (or --offline) it computes the same set from the lockfile minus your allowScripts entries (bare-name and pinned keys both count, and false is a decision too — matching npm v12's semantics exactly).

--output-allowscripts merges version-pinned entries for every reviewed package into package.json, preserving existing decisions: SAFE/LOW default to true, HIGH/MEDIUM and OSV-flagged packages to false — flip after reading the evidence. --json emits the whole review (pending, risk, content, suggested block) for scripting. NPM_SCRIPT_LENS_NPM overrides which npm the dry-run uses.

allow: pre-approve the safe packages, hold the risky ones — in any package manager

allow runs the scan and splits every package that has install-time scripts into two buckets — the ones behavioral analysis found harmless (SAFE/LOW) go straight into the allowlist; everything that spawns processes, reaches the network, is known-malicious, or couldn't be fetched (MEDIUM/HIGH) is held back in a _review list for a human. It emits the block in your package manager's native format, auto-detected from the lockfile, on stdout — with a one-line summary on stderr:

npx npm-script-lens allow                     # scan, print the native allowlist block + _review
npx npm-script-lens allow --write             # …and merge the auto-approved entries into the right file
npx npm-script-lens allow --manager pnpm      # force a manager instead of auto-detecting
npx npm-script-lens allow --input audit.json  # classify a saved `audit --json` result, no rescan

Every major package manager adopted the same "scripts are opt-in, keep an allowlist" model. allow writes each one's native format — same risk policy, same analysis, different file:

manager	allowlist	file	`allow --write` target
npm 12	`allowScripts: { "[email protected]": true }`	package.json	package.json
pnpm 10.26+/11	`allowBuilds: { pkg: true }`	pnpm-workspace.yaml	pnpm-workspace.yaml (comment-preserving)
yarn Berry	`dependenciesMeta.<pkg>.built: true`	package.json	package.json + `enableScripts: false` in .yarnrc.yml
bun	`trustedDependencies: ["pkg"]`	package.json	package.json

// npm project → allowScripts (version-pinned)
{ "allowScripts": { "[email protected]": true }, "_review": ["[email protected]"] }
// pnpm project → allowBuilds (by name)
{ "allowBuilds": { "core-js": true }, "_review": ["[email protected]"] }

1 package auto-approved, 1 need manual review. (pnpm — allowlist in pnpm-workspace.yaml)   ← stderr

bun caveat (surfaced automatically): defining trustedDependencies replaces bun's built-in trusted list, so packages bun trusted by default (esbuild, sharp…) stop running scripts unless listed. yarn needs enableScripts: false to turn dependenciesMeta into an allowlist — allow --write sets it for you.

CI guard

allow --ci-check runs no scan — it's a fast gate for CI. It exits 1 when all three are true: a workflow in .github/workflows/ runs npm install/npm i/npm ci, package.json has no allowScripts block, and the local npm is v12+ (probed via npm --version). That is exactly the combination where npm v12 will silently skip every dependency's install scripts and your build breaks with no obvious cause.

npx npm-script-lens allow --ci-check
# CI will break on npm v12: run lens allow to generate allowScripts block.  (exit 1)

Any one of those conditions being false — npm < 12, an existing allowScripts block, or no npm install in CI — passes with a one-line reason. To fix a failing check, run allow --write: it writes the auto-approved entries and leaves the _review packages out (writing them would be deciding for you — they stay pending until a human looks).

Governance policy

By default allow/review/sync auto-approve SAFE/LOW behavioral risk. A script-lens.policy.json in the project root (or --policy <file>) turns that fixed heuristic into a team decision:

{
  "autoApprove": {
    "maxRisk": "LOW",            // approve up to this risk (SAFE|LOW|MEDIUM|HIGH)
    "denyCapabilities": ["net"], // never auto-approve a script that reaches the network…
    "minAgeDays": 30,            // …or a version published < 30 days ago (needs trust data)
    "requireProvenance": false   // …or one without sigstore provenance
  },
  "waivers": {
    "sharp": { "allow": true, "reason": "vetted native build", "expires": "2027-01-01" }
  }
}

Waivers are explicit human decisions that override the heuristic until they expire — an auditable record of why a risky package was trusted. With no policy file present, behavior is exactly the built-in default.

Keeping the allowlist alive — in any package manager

Version-pinned npm entries are silently invalidated by every dependency bump; name-keyed managers (pnpm/yarn/bun) drift as packages come and go. sync reconciles your manager's native allowlist with the lockfile — auto-detected, written in the right format:

npx npm-script-lens sync --check     # CI: exit 1 when the allowlist drifted
npx npm-script-lens sync --write     # drop stale entries, add new scripted packages,
                                     # (npm) re-pin upgrades — PRESERVING decisions when
                                     # the new version gained no capabilities
npx npm-script-lens review --output-allowscripts  # review pending WITH script content, then write
npx npm-script-lens approve          # step through risky packages interactively (npm)

One-command adoption

npx npm-script-lens init             # scaffold script-lens.policy.json + a CI workflow

init writes a starter policy and a ready-to-commit GitHub Action (audit + allow --ci-check gate), skipping anything that already exists (--force to overwrite). Add --auto-fix for a Renovate/Dependabot bot workflow, or --hook to install a git pre-commit hook that runs sync --check. Prefer the pre-commit framework? This repo ships a .pre-commit-hooks.yaml.

npm v12 approve-scripts bug check

npm v12's own tooling has two known bugs that leave teams with a green approve-scripts run and a red npm ci:

Optional dependency gap (npm/cli#9562): npm approve-scripts --allow-scripts-pending never lists optional dependencies — but npm ci --strict-allow-scripts still rejects any optional dep with install scripts that is missing from allowScripts. The classic trap is fsevents: it only installs on macOS, so on a Linux CI runner nothing surfaces it, and strict mode fails the build anyway.
EGLOBAL in global installs (npm/cli#9463): when npm install -g <pkg> warns about unreviewed install scripts, the suggested npm approve-scripts command errors with EGLOBAL — there is no post-install approval path in global contexts. The working form is allowing at install time: npm install -g --allow-scripts=<pkg> <pkg>.

npx npm-script-lens audit --check-v12-gaps            # markdown report
npx npm-script-lens audit --check-v12-gaps --json     # { findings: [...] }
npx npm-script-lens audit --check-v12-gaps --sarif v12.sarif

The first check reads optional + hasInstallScript from your package-lock.json, resolves the actual script names from registry metadata, and flags every optional dep with install scripts that your allowScripts block doesn't cover (bare-name and version-pinned keys both count as decisions). The second scans .github/workflows/*.yml for npm install -g / npm i -g lines, checks each installed package's registry metadata for install scripts, and flags the ones without an --allow-scripts guard — anchored to the exact workflow file and line. Findings are severity warn and never fail the run; packages the registry can't confirm are skipped rather than guessed (except when the lockfile itself says hasInstallScript, which is trusted even if the registry is unreachable).

In the GitHub Action this runs as a separate step controlled by check-v12-gaps (default auto: runs only when the runner's npm is v12+). It writes to the job summary, emits ::warning annotations, and merges its findings into the SARIF file from the main audit step so code scanning shows them too.

Committed audit manifest

The strongest review signal is a diff a human already reads: the PR diff itself. manifest writes a stable, minimal receipt of install-time behavior — sorted name@version → capability kinds — that you commit next to your lockfile. When a dependency change alters what install scripts can do, the git diff of that file is the approval-surface change, reviewable with zero tooling:

npx npm-script-lens manifest --write     # writes script-lens.json next to the lockfile
npx npm-script-lens manifest --check     # CI: exit 1 if behavior drifted from the committed file

{
  "tool": "npm-script-lens",
  "version": "0.4.0",
  "packages": {
    "[email protected]": { "risk": "HIGH", "capabilities": ["env", "exec", "obf"] }
  }
}

It records behavior only — no download counts, publish age, or OSV status — so the file changes when a package's capabilities change, not when its popularity does (live malware/trust checks stay in audit). A bump in the version field means the detector itself changed and results are worth re-reviewing. In the Action, set manifest-check: 'true' to fail PRs that leave the manifest stale, with the drift written to the job summary. (Requested by @raju_dandigam — thanks!)

MCP server (for AI agents)

npx npm-script-lens mcp

Runs an MCP stdio server with three tools: audit_package (audit one package — before an agent adds it as a dependency), audit_lockfile, and classify_allowscripts (audit a lockfile and return the allow split — {allowScripts, _review} — so an agent can generate the block non-interactively). Claude Code config:

{ "mcpServers": { "npm-script-lens": { "command": "npx", "args": ["npm-script-lens", "mcp"] } } }

Real output for a project depending on sharp, prisma, core-js, chalk (39 locked packages, ~5s): see fixtures/demo-report.md. Highlights:

package	script	risk	signals
`[email protected]` 1.9y old · 74M dl/wk · 1 maintainer	install	🔴 HIGH	`exec: node-gyp rebuild --directory=src` · `exec: require('child_process')` …
`@prisma/[email protected]` via prisma · 15M dl/wk · provenance ✓	postinstall	🔴 HIGH	`net: require('@prisma/fetch-engine')` · `exec: require('execa')` · `fs: writeFileSync` …
`[email protected]`	postinstall	🟡 LOW	`fs: fs.writeFileSync` · `env: process.env`
`[email protected]`	—	🟢 SAFE	no lifecycle scripts

{
  "allowScripts": {
    "@prisma/[email protected]": false,
    "[email protected]": true,
    "[email protected]": true,
    "[email protected]": false
  }
}

GitHub Action

name: audit-install-scripts
on: pull_request
permissions:
  pull-requests: write
jobs:
  lens:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: Booyaka101/npm-script-lens@v1
        with:
          path: '.'               # dir or lockfile; npm/yarn/pnpm auto-detected
          fail-on-high: 'true'    # exit 1 when a HIGH-risk script appears
          comment-on-pr: 'true'   # post the report as a PR comment

The action writes the report to the job summary, comments on the PR (plain GitHub REST issues/comments call using GITHUB_TOKEN — same endpoint octokit uses), and fails the job when fail-on-high is true and a HIGH package exists.

Optional inputs: diff-base (audit only packages added/upgraded vs a base lockfile, e.g. one extracted from the PR base branch), check-v12-gaps (auto/true/false — the npm v12 approve-scripts bug check, auto-enabled when the runner's npm is v12+), ci-check ('true' to enable — the allow --ci-check gate as a fail-fast Action step: fails the job when the runner's npm is v12+, a workflow runs npm install, and package.json has no allowScripts block, before the missing block silently breaks a downstream install), sync-check ('true' — fails the job when the install-script allowlist has drifted from the lockfile; cross-ecosystem, auto-detects npm/pnpm/yarn/bun), and sarif-file for code scanning alerts:

      - uses: Booyaka101/npm-script-lens@v1
        with:
          sarif-file: lens.sarif
      - uses: github/codeql-action/upload-sarif@v3
        if: always()
        with:
          sarif_file: lens.sarif

Run from source

npm install --ignore-scripts
node src/cli.js audit --path fixtures/demo --fail-on-high
npm test        # analyzer/lockfile/reporter units, offline mock-registry tests,
                # live acceptance against the real registry, and a full action
                # dry-run against a local mock GitHub API

Node.js ≥ 20 (uses global fetch). No paid APIs — the public npm registry, plus the free OSV.dev and npm downloads APIs for trust enrichment (--no-trust or --offline to skip).

Staying current with npm

This tool's value is coupled to npm's own behavior — the allowScripts field, the unreviewedScripts shape in npm install --dry-run --json, the approve-scripts commands. Those will drift across npm releases, so npm-script-lens is built to notice when they do rather than fail silently:

npx npm-script-lens doctor          # does this build still understand your npm?
npx npm-script-lens doctor --json   # machine-readable, for scripts/CI

doctor probes your local npm and reports each contract assumption — version, allowScripts enforcement, a parser self-test, a live dry-run shape check, and each npm-bug detector's upstream status — then exits 1 on genuine drift (an npm output shape this build no longer recognizes). Under the hood:

Every npm coupling lives in one file (src/npm-contract.js) — a future npm change is a one-line patch, not a hunt.
review warns loudly and falls back instead of silently trusting an unfamiliar npm answer as "nothing pending".
A scheduled npm-compat canary (.github/workflows/npm-compat.yml) drives the real npm across 12/latest/next on a matrix and goes red on drift — the tripwire the unit tests (which use stub npms) can't be.
The two npm-v12 approve-scripts bug detectors are version-aware: the report says which npm it checked and links each bug's upstream status, so a detector can't quietly outlive the bug it was written for.

Exit codes

code	meaning
`0`	success (or findings that are warn-level only, e.g. `audit --check-v12-gaps`)
`1`	an actionable failure: `audit --fail-on-high` found HIGH/malicious · `sync --check`/`manifest --check` drift · `allow --ci-check` would break on npm v12 · `doctor` detected npm drift · `diff` found an added/modified install script
`2`	a usage/runtime error (bad ref, missing lockfile, unreadable input)

Commands at a glance

command	does
`audit`	scan a lockfile, report install-script risk (Markdown/JSON/SARIF); `--fail-on-high`, `--diff`/`--since`, `--check-v12-gaps`
`allow`	split scripted packages into an auto-approved allowlist + `_review`, in your manager's native format; `--write`, `--ci-check`, `--manager`, `--policy`
`review`	show pending approvals with the actual script content + verdict; `--output-allowscripts` writes decisions
`diff`	compare a package's install scripts (+ implicit node-gyp) across two versions; exit 1 on any add/modify; `--json`
`sync`	reconcile the native allowlist with the lockfile (drop stale, add new); `--check` for CI
`doctor`	is this build still in sync with your npm? contract probe + drift alarm
`init`	scaffold policy + CI workflow (`--auto-fix` bot, `--hook` git pre-commit)
`manifest`	committable behavior receipt whose git diff is the approval-surface change
`completion`	print a shell completion script (bash / zsh / fish)
`mcp`	MCP server for AI agents (`audit_package`, `audit_lockfile`, `classify_allowscripts`)

How it compares

The install-script-allowlist space has good tools — but each covers one slice:

	behavioral risk analysis	npm	pnpm	yarn	bun	writes native allowlist	policy / waivers	CI drift gate	MCP
npm-script-lens	✅ exec/net/fs/obf + OSV + trust	✅	✅	✅	✅	✅	✅	✅	✅
`@lavamoat/allow-scripts`	❌ (allowlist mgmt only)	✅	✅	✅	❌	✅	❌	partial	❌
`can-i-ignore-scripts`	❌ (lists scripts)	✅	✅	✅	❌	❌	❌	❌	❌
native `npm approve-scripts` / `pnpm approve-builds` / `bun pm trust`	❌	one each				✅	❌	❌	❌

The combination — behavioral evidence for the decision, in every manager's native format, with policy and CI enforcement — is what makes it the one tool to standardize on.

Honest limitations

Static capability detection, not proof of malice. A HIGH score means "this script can spawn processes" — exactly the question to answer before approving, but plenty of HIGH packages (native builds) are legitimate. The lens gives evidence; you make the call. Only sandboxed execution could say more, and running untrusted install scripts to observe them is deliberately out of scope.
Scripts invoking binaries from other packages (husky install, patch-package) are resolved when a lockfile package with the same name owns the bin: that package's actual bin script is fetched, analyzed, and the row is re-scored on real evidence (bin: husky install → [email protected] + what the script actually does). Bins with no same-name owner in the lockfile stay conservatively HIGH as exec: … (unresolved binary).
Helper dependencies: capability hidden inside helpers is caught via a curated list (axios, got, undici, @prisma/fetch-engine, …) plus --deep, which follows bare require()s from install-script code into the matching lockfile package's entry file (one level). A helper outside the lockfile, or loaded indirectly, can still slip a tier.
Obfuscation: eval/new Function/vm and string-built require()s score HIGH, and base64/char-code literal payloads are decoded and re-analyzed — the report shows what the hidden code actually does, not just that it hides. Payloads assembled only at runtime (downloaded, decrypted, env-derived) remain opaque: flagged, not decoded. Plain variable indirection (require(someVar)) is deliberately not flagged — it's ubiquitous in bundler output.

Get it

CLI: npx npm-script-lens audit — npmjs.com/package/npm-script-lens
GitHub Action: uses: Booyaka101/npm-script-lens@v1 — releases
VS Code extension: inline install-script risk in package.json — editors/vscode
Neovim plugin: vim.diagnostic on package.json — editors/nvim
MCP server for AI agents: npx npm-script-lens mcp
Pre-commit: init --hook or the pre-commit framework · HTML report: audit --html report.html
Join the conversation: npm/rfcs#897 (allowScripts review-report RRFC) · npm v12 migration discussion

Name		Name	Last commit message	Last commit date
Latest commit History 19 Commits
.github/workflows		.github/workflows
editors		editors
fixtures		fixtures
scripts		scripts
src		src
test		test
.gitattributes		.gitattributes
.gitignore		.gitignore
.pre-commit-hooks.yaml		.pre-commit-hooks.yaml
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
PROGRESS.md		PROGRESS.md
README.md		README.md
RESUME.md		RESUME.md
action.yml		action.yml
package-lock.json		package-lock.json
package.json		package.json
review-demo.png		review-demo.png
script-lens.json		script-lens.json

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npm-script-lens

CLI

diff: what did an upgrade change in the install scripts?

review: see what you're approving, not just its name

allow: pre-approve the safe packages, hold the risky ones — in any package manager

CI guard

Governance policy

Keeping the allowlist alive — in any package manager

One-command adoption

npm v12 approve-scripts bug check

Committed audit manifest

MCP server (for AI agents)

GitHub Action

Run from source

Staying current with npm

Exit codes

Commands at a glance

How it compares

Honest limitations

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npm-script-lens

CLI

diff: what did an upgrade change in the install scripts?

review: see what you're approving, not just its name

allow: pre-approve the safe packages, hold the risky ones — in any package manager

CI guard

Governance policy

Keeping the allowlist alive — in any package manager

One-command adoption

npm v12 approve-scripts bug check

Committed audit manifest

MCP server (for AI agents)

GitHub Action

Run from source

Staying current with npm

Exit codes

Commands at a glance

How it compares

Honest limitations

Get it

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