This tool takes 2 files containing output of npm list or npm install or similar results (e.g. Travis CI build logs) and calculates changes to the NPM packages and versions from first file to second.

More specific use case:

• A build is broken on Travis because of unknown dependency change
• Copy output of npm install from the last successful build to file1
• Copy output of npm install from the broken build to file2
• Use this tool to diff the package lists

coffee npmdiff.coffee <file1> <file2>

• CoffeeScript, Node.js