IconVault's NPM Health grades any npm package with 9 real metrics pulled live from the npm registry: maintenance activity, weekly download volume, deprecation status, license declaration, repository link, readme presence, maintainer count, version count and dependency count. The results roll up into a simple A-F health grade so you can judge a package at a glance before adding it to your project.

Everything runs fully in your browser: the registry is queried directly from this page, nothing is installed and nothing is uploaded. It is free to use with no signup. The honest caveat: the grade is a heuristic, not a security audit. Download counts can be inflated by CI systems and mirrors, and a healthy-looking package can still contain vulnerabilities, so pair this check with a proper security scan before shipping.