happa - a simple CLI tool for listing installed / resolved npm packages

happa checks and prints the installed / resolved versions of specified packages, without needing to run pnpm list or pnpm why in each repository.

It is designed for easy list up of packages across many repositories at once, and to be used alongside other commands such as grep.

The term happa comes from the Japanese word for leaf. The name is a play on the leaves of a dependency tree.

Important

This tool only supports pnpm at the moment.

Install

go install github.com/stefafafan/happa/cmd/happa@latest

Usage

Check the current repository for specified packages (in this case, react and vite):

happa react vite

You can also pipe package names from other commands, such as find or printf:

printf 'react\nvite\n' | happa

Check repositories with pnpm-workspace.yaml from a parent directory:

find . -mindepth 2 -maxdepth 2 -name pnpm-workspace.yaml -print \
  | sed 's#/pnpm-workspace.yaml$##' \
  | happa --repo - react

Default output is TSV. If the package is not found, it is omitted from the output.

happa	react	installed	19.1.0
happa	react	resolved	19.1.0

Using alongside grep, happa makes it easy to check for specific versions.

happa react | grep '19.1.0'

JSON is also available:

happa --format json react