fs-extra
popularfs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as recursive mkdir, copy, and remove.
Updated by @jprichardson
strip-json-comments
Strip comments from JSON. Lets you use comments in your JSON files!
Updated by @sindresorhus
configstore
Easily load and save config without having to think about where and how
Updated by @sindresorhus
serialize-javascript
Serialize JavaScript to a superset of JSON that includes regular expressions and functions.
Updated by @okuryu
stringify-object
Stringify an object/array like JSON.stringify just without all the double-quotes
Updated by @sindresorhus