formidable
A node.js module for parsing form data, especially file uploads.
type-fest
A collection of essential TypeScript types
superstruct
A simple and composable way to validate data in JavaScript (and TypeScript).
fs-extra
fs-extra contains methods that aren't included in the vanilla Node.js fs package. Such as recursive mkdir, copy, and remove.
jsonpath
Query JavaScript objects with JSONPath expressions. Robust / safe JSONPath engine for Node.js.