JSON.stringify with fixed maximum character width.
Node.js atomic and non-atomic counters, rate limiting tools, protection from DoS and brute-force attacks at scale
The scrypt password-based key derivation function with sync and cancellable async.
A tiny Solidity ABI encoder and decoder
ReactTable HOC for fixed columns
Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
A 2D spatial index for axis-aligned boxes
Circular fixed size array
An extendable Error class that actually works, with TypeScript definition files, supporting old and new style classes and compatibility even with the oldest browsers
A superset of the JSDOM environment for Jest that respects Node.js globals.
A tiny, dynamic list virtualization library for React
A tiny (130B to 205B) and fast utility to randomize unique IDs of fixed length
OCSP Stapling implementation
Converts a decimal number using fixed-point notation, avoiding the conversion from number to string of Number.toFixed, and allowing the user to choose the approximation method to be used
Wordwrap a string with ANSI escape codes
A tiny, PEG-like system for building language grammars with regexes.
A fast function for calculating where a string should be truncated, given an optional width limit and an ellipsis string.
A React table component
A fixed-width file format toolset with streaming support and flexible options.
mdast utility to get the plain text content of a node
Generates an image from a DOM node using HTML5 canvas and SVG
Lightweight, dependency free, fast, customizable datepicker written in pure JavaScript. 
Modify strings, generate sourcemaps
Responsive utility wrapper for Facebook's Fixed-Data-Table