Determines changes in package-lock.json files

Usage no npm install needed!

<script type="module">
  import 43081jLockcheck from 'https://cdn.skypack.dev/@43081j/lockcheck';



A tiny utility to analyze package-lock.json files for potential problems, inconsistencies and security issues.


$ npm i -D @43081j/lockcheck


$ npx lockcheck


  -d, --dir <path>  Path to directory containing lock file. (default: ".")
  --diff [commit]   Enable diff mode on the specified gitcommit (default is
                    against unchanged file in current branch)
  -v, --verbose     Verbose output
  -h, --help        output usage information


lockcheck will analyze lock files for the following:

Insecure URIs - Any http URIs are considered unsafe and should be replaced with secure equivalents.

Duplicate versions - Multiple occurrences of a single package with different URLs is a sign of a possibly misconfigured lock file.

Manifest inconsistencies - Packages which exist in the lock file but do not match/satisfy the corresponding entry in package.json are likely misconfigured.

Registry inconsistencies - Unscoped packages in a lock file should all have the same registry. It is valid, however, to have scoped packages use a separate registry.

Diff mode

You can diff two lock files like so:

$ npx lockcheck --diff

This will attempt to use git in order to compare the lock file on disk and the original lock file in git (assuming there is a difference).

Alternatively, you can pipe a lock file into lockcheck to compare against:

$ git show :package-lock.json | npx lockcheck --diff

Or you can specify a commit-ish:

$ npx lockcheck --diff master