- crypto
- semver
The semantic version parser used by npm.
- debug
small debugging utility
- moment
Parse, validate, manipulate, and display dates
- qs
A querystring parser that supports nesting and arrays, with a depth limit
- postcss
- js-yaml
YAML 1.2 parser and serializer
- cheerio
Tiny, fast, and elegant implementation of core jQuery designed specifically for the server
- mocha
simple, flexible, fun test framework
- Top 12 Jupyter Notebook extensions