Developer Tools · Productivity
Package Checkup
Inspect an npm package before you install or ship it
Package Checkup runs the same live engine here and in your assistant
Live playground
Use Package Checkup now
Point either tool at a public npm package and get the same engine-backed verdict a connected assistant gets — the exact published tarball is downloaded, hash-verified, and analyzed without ever installing or executing it.
Your usage
—
Free forever — create a free account for a bigger monthly allowance that follows you across every app and every assistant.Pooled across every app and surface. Manage usage
Loading the live tools…
Marketplaces
Open Package Checkup where you already work — every listing runs the same live engine as this page.
- Marketplace listings are on the way. Meanwhile, point any MCP-compatible assistant straight at the live endpoint:
https://powmcp.com/npm-package-preflight/mcp
Proof
Real apps.Real engines.Real results.
- Application
- Package Checkup
- Category
- Developer Tools
- Platform
- Web
Engine Anatomy
Proof
Package Checkup
What it does
Inspect an npm package before you install or ship it
Check exact npm tarballs for packaging mistakes, module and TypeScript compatibility, shipped-file bloat, lifecycle scripts, integrity, provenance signals, and release health without installing them — before you adopt a dependency or announce your own published release.
Tools in this application
Package Check
package_check
package_check
Package Compare
package_compare
package_compare
0USD
Free to use with fair-use rate limits.
Package Checkup questions
Scope and boundaries for Package Checkup.
01What does Package Checkup actually check?
Check exact npm tarballs for packaging mistakes, module and TypeScript compatibility, shipped-file bloat, lifecycle scripts, integrity, provenance signals, and release health without installing them — before you adopt a dependency or announce your own published release.
02What does it never do?
It reports what its pinned engine measured and nothing more — it does not judge quality, correctness of your underlying business decisions, or anything outside its stated scope, and it never fabricates a result.
03What does it cost?
Nothing. Every published app is free to use with fair-use rate limits.
04Can my assistant connect directly?
Yes — any MCP-compatible assistant can connect straight to the canonical endpoint: https://powmcp.com/npm-package-preflight/mcp. Marketplace listings are conveniences over the same live engine.