I think of all the npm packages I've made over the years, my favorite is @suchipi/at-js

https://www.npmjs.com/package/@suchipi/at-js

@suchipi/at-js

unix stdin-pipe-based tools for transforming data with JavaScript. Latest version: 1.6.1, last published: 7 minutes ago. Start using @suchipi/at-js in your project by running `npm i @suchipi/at-js`. There are no other projects in the npm registry using @suchipi/at-js.

npm
it's a JS-based command-line pipe utility; think sed/awk/grep/xargs but for Node.js
it's not fundamentally ground-breaking, but I use it a lot. it pairs great with pbcopy and pbpaste