An evented streaming XML parser in JavaScript

Snappy codec for kafkajs in typescript

Does the current JS environment have strict mode? ES5+ should; but let's not assume.

A string tag that strips indentation from multi-line strings. ⬅️

mjml-validator

A generational cache with strict entry-count limits and payload validation.

The node.js assert module, re-packaged for web browsers.

Collection of code generation tools to make web services with strict typing & validation through JSON schema.

Modern [IndexedDB](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API) wrapper with Promises, AsyncIterables and strict typing.

Drop-in replacement for assert to give diff on deepEqual.

A strict ISO 8601 (RFC 3339) datetime validation regex with full calendar correctness (leap years, day/month limits, and timezone validation). Includes a comprehensive node:test suite.

Full type-safe HTTP client wrapper around `fetch`, designed for strict typing of API routes, parameters, and responses — with zero codegen.

Delightful mocks for JavaScript and TypeScript.

HTTP Strict Transport Security middleware.

Check if a string is a valid JavaScript expression

ECMAScript scope analyzer for ESLint

[](https://discord.gg/poimandres)

Build environment checking (a la autoconf) for node.js

Pure node.js library for comparing PNG-images, taking into account human color perception.

ECMAScript reserved words checker