Packages

AST

• Acorn - Tiny, fast JavaScript parser.
• Rocambole - Recursively walk and transform JavaScript AST.

Authentication

• passwordless - Token-based authentication middleware for Express allowing authentication without passwords.
• passwordless - Token-based authentication middleware for Express allowing authentication without passwords.
• everyauth - Authentication and authorization (password, Facebook, etc) for your Connect and Express apps.
• Lockit - Full featured authentication solution for Express. Supports a variety of databases, predefined routes, email and two-factor authentication.
• Grant - OAuth middleware for Express, Koa, and Hapi.

Automation

• robotjs - Desktop Automation: control the mouse, keyboard and read the screen.

Benchmarking

• matcha - Simplistic approach to benchmarking.

Blogging

• ghost - Simple, powerful publishing platform.

Build tools

• webpack - Packs modules and assets for the browser.
• rollup - Next-generation ES2015 module bundler.
• Broccoli - Fast, reliable asset pipeline, supporting constant-time rebuilds and compact build definitions.
• Brunch - Front-end web app build tool with simple declarative config, fast incremental compilation, and an opinionated workflow.
• strong-build - Build a node app package and prepare to deploy it as a package to production or use git to commit to a deploy branch.
• ygor - Promising task runner for when npm run isn't enough and everything else is too much.
• FuseBox - Fast build system that combines the power of webpack, JSPM and SystemJS, with first-class TypeScript support.
• pkg - Package your Node.js project into an executable.
• browserify - Browser-side require() the Node.js way.

Command-line apps

• lessmd - Markdown in the terminal.
• np - Better npm publish.
• trash - Safer alternative to rm.
• npm-name - Check whether a package name is available on npm.
• speed-test - Test your internet connection speed and ping.
• emoj - Find relevant emoji from text on the command-line.
• pageres - Capture website screenshots.
• vtop - More better top, with nice charts.
• empty-trash - Empty the trash.
• is-up - Check whether a website is up or down.
• is-online - Check if the internet connection is up.
• public-ip - Get your public IP address.
• clipboard-cli - Copy & paste on the terminal.
• ttystudio - Record your terminal and compile it to a GIF or APNG without any external dependencies, bash scripts, gif concatenation, etc.
• XO - Enforce strict code style using the JavaScript happiness style.
• Standard - JavaScript Standard Style — One style to rule them all.
• dev-time - Get the current local time of a GitHub user.
• David - Tells you when your package npm dependencies are out of date.
• http-server - Simple, zero-config command-line HTTP server.
• Live Server - Development HTTP-server with livereload capability.
• bcat - Pipe command output to web browsers.
• normit - Google Translate with speech synthesis in your terminal.
• slap - Sublime-like terminal-based text editor.
• jsinspect - Detect copy-pasted and structurally similar code.
• esformatter - JavaScript code beautifier/formatter.
• fkill - Fabulously kill processes. Cross-platform.
• pjs - Pipeable JavaScript. Quickly filter, map, and reduce from the terminal.
• license-checker - Check licenses of your app's dependencies.
• browser-run - Easily run code in a browser environment.
• tmpin - Adds stdin support to any CLI app that accepts file input.
• modhelp - Syntax-highlighted module READMEs in terminal with ANSI-friendly pager.
• wifi-password - Get the current wifi password.
• wallpaper - Change the desktop wallpaper.
• brightness - Change the screen brightness.
• torrent - Download torrents.
• tfa - Two-factor authentication client.
• rtail - Terminal output to the browser in seconds, using UNIX pipes.
• kill-tabs - Kill all Chrome tabs to improve performance, decrease battery usage, and save memory.
• vantage - Distributed, realtime CLI for your live app.
• subdownloader - Subtitle downloader for movies and TV series.
• dark-mode - Toggle the macOS Dark Mode.
• iponmap - IP location finder.
• Jsome - Pretty prints JSON with configurable colors and indentation.
• itunes-remote - Interactively control iTunes.
• text-meme - Generate a text meme.
• mobicon - Mobile app icon generator.
• mobisplash - Mobile app splash screen generator.
• diff2html-cli - Pretty git diff to HTML generator.
• Cash - Cross-platform Unix shell commands in pure JavaScript.
• vaca - Get a random ASCII 🐮.
• gh-home - Open the GitHub page of the repo in the current directory.
• npm-home - Open the npm page of a package.
• trymodule - Try out npm packages in the terminal.
• terminal-recorder - Record your terminal usage and export it to interactive HTML.
• jscpd - Copy/paste detector for source code.
• atmo - Server-side API mocking.
• auto-install - Auto installs dependencies as you code.
• cost-of-modules - Find out which dependencies are slowing you down.
• localtunnel - Expose your localhost to the world.
• pen - Live Markdown preview in the browser from your favorite editor.
• alex - Catch insensitive, inconsiderate writing.

Command-line utilities

• log-symbols - Colored symbols for various log levels.
• figures - Unicode symbols with Windows CMD fallbacks.
• cross-env - Set environment variables cross-platform.
• shelljs - Portable Unix shell commands.
• chalk - Terminal string styling done right.
• meow - CLI app helper.
• get-stdin - Easier stdin.
• ora - Elegant terminal spinner.
• log-update - Log by overwriting the previous output in the terminal. Useful for rendering progress bars, animations, etc.
• Inquirer.js - Interactive command-line prompt.
• listr - Terminal task list.
• conf - Simple config handling for your app or module.
• update-notifier - Update notifications for your CLI app.
• ansi-escapes - ANSI escape codes for manipulating the terminal.
• boxen - Create boxes in the terminal.
• string-width - Get the visual width of a string - the number of columns required to display it.
• cli-truncate - Truncate a string to a specific width in the terminal.
• first-run - Check if it's the first time the process is run.
• vorpal - Interactive CLI apps.
• blessed - Curses-like library.
• yn - Parse yes/no like values.
• cli-table - Pretty unicode tables.
• drawille - Draw on the terminal with unicode braille characters.
• sudo-block - Block users from running your app with root permissions.
• ascii-charts - ASCII bar chart in the terminal.
• cli-cursor - Toggle the CLI cursor.
• columnify - Create text-based columns suitable for console output. Supports cell wrapping.
• cli-columns - Columnated unicode and ansi-safe text lists.
• cfonts - Sexy ASCII fonts for the console.
• multispinner - Multiple, simultaneous, individually controllable CLI spinners.
• omelette - Shell autocompletion helper.
• loud-rejection - Make unhandled promise rejections fail loudly instead of the default silent fail.
• sparkly - Generate sparklines ▁▂▃▅▂▇
• term-img - Display images in your terminal.
• yargs - Command-line parser that automatically generates an elegant user-interface.
• DraftLog - Create multiple updatable log lines. Works just like console.log.
• Bit - Create, maintain, find and use small modules and components across repositories.
• insight - Helps you understand how your tool is being used by anonymously reporting usage metrics to Google Analytics.

Compression

• yazl - Zip.
• yauzl - Unzip.
• Archiver - Streaming interface for archive generation, supporting ZIP and TAR.
• pako - High speed zlib port to pure js (deflate, inflate, gzip).
• tar-stream - Streaming tar parser and generator. Also see tar-fs.
• decompress - Decompression module with support for tar, tar.gz and zip files out of the box.

Control flow

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• Bluebird - Promise library with focus on innovative features and performance.
• pify - Promisify a callback-style function.
• delay - Delay a promise a specified amount of time.
• promise-memoize - Memoize promise-returning functions, with expire and prefetch.
• valvelet - Limit the execution rate of a promise-returning function.
• p-map - Map over promises concurrently.
• zen-observable - Implementation of Observables.
• RxJS - Reactive programming.
• observable-to-promise - Convert an Observable to a Promise.
• co - The ultimate generator based flow-control goodness.
• bluebird-co - High performance yield handlers for Bluebird coroutines.
• iterum - Build generator pipelines using Array-like methods.
• each-async - Async concurrent iterator like forEach.
• async - Provides straight-forward, powerful functions for working with asynchronicity.
• js-csp - Communicating sequential processes for JavaScript (like Clojurescript core.async, or Go).
• zone - Provides a way to group and track resources and errors across asynchronous operations.
• Highland.js - Manages synchronous and asynchronous code easily, using nothing more than standard JavaScript and Node-like Streams.

Database

• PostgreSQL - PostgreSQL client. Pure JavaScript and native libpq bindings.
• Redis - Redis client.
• LevelUP - LevelDB.
• MySQL - MySQL client.
• Aerospike - Aerospike client.
• Couchbase - Couchbase client.
• MongoDB - MongoDB driver.
• Sequelize - Multi-dialect ORM. Supports PostgreSQL, SQLite, MySQL.
• Massive - PostgreSQL data access tool.
• Waterline - Datastore-agnostic tool that dramatically simplifies interaction with one or more databases.
• Iridium - MongoDB ORM with support for promises, distributed caching, preprocessing, validation and plugins.
• OpenRecord - ORM for PostgreSQL, MySQL, SQLite3 and RESTful datastores. Similar to ActiveRecord.
• orm2 - ORM for PostgreSQL, MariaDB, MySQL, Amazon Redshift, SQLite, MongoDB.
• firenze - Adapter-based ORM for MySQL, Memory, Redis, localStorage and more.
• pg-promise - PostgreSQL framework for native SQL using promises.
• Objection.js - Lightweight ORM built on the SQL query builder Knex.
• NeDB - Embedded persistent database written in JavaScript.
• Lowdb - Small JavaScript database powered by Lodash.

Data validation

• joi - Object schema description language and validator for JavaScript objects.
• is-my-json-valid - JSON Schema validator that uses code generation to be extremely fast.
• property-validator - Easy property validation for Express.
• ajv - The fastest JSON Schema validator. Supports v5 proposals.
• schema-inspector - JSON API sanitization and validation.

Date

• Moment Timezone - IANA Time Zone Database + Moment.js.
• date-fns - Modern date utility.
• Moment Timezone - IANA Time Zone Database + Moment.js.
• dateformat - Date formatting.
• tz-format - Format a date with timezone: 2015-11-30T10:40:35+01:00.
• cctz - Fast parsing, formatting, and timezone conversation for dates.
• Moment.js - Parse, validate, manipulate, and display dates.

Debugging / Profiling

• ironNode - Node.js debugger supporting ES2015 out of the box.
• node-inspector - Debugger based on Blink Developer Tools.
• devtool - Run Node.js programs through Chrome Dev Tools.
• Theseus - JavaScript debugger featuring real-time code coverage, retroactive inspection and asynchronous call tree.
• longjohn - Long stack traces with configurable call trace length.
• debug - Tiny debugging utility.
• jstrace - Dynamic tracing for JavaScript, similar to dtrace, ktap etc.
• why-is-node-running - Node.js is running but you don't know why?
• njsTrace - Instrument and trace your code, see all function calls, arguments, return values, as well as the time spent in each function.
• vstream - Instrumentable streams mix-ins to inspect a pipeline of streams.
• stackman - Enhance an error stacktrace with code excerpts and other goodies.
• locus - Starts a REPL at runtime that has access to all variables.
• bugger - Provides Chrome Devtools bindings to debug programs in Chrome.
• 0x - Flamegraph profiling.
• ctrace - Well-formatted and improved trace system calls and signals.
• leakage - Write memory leak tests.

Documentation

• JSDoc - API documentation generator similar to JavaDoc or PHPDoc.
• YUIDoc - Generates API documentation from comments in source.
• dox - JavaScript documentation generator using Markdown and JSDoc.
• jsdox - JSDoc3 to Markdown documentation generator.
• apiDoc - Inline documentation for RESTful web APIs.
• JSDoc - API documentation generator similar to JavaDoc or PHPDoc.
• JSDoc - API documentation generator similar to JavaDoc or PHPDoc.

Email

• Nodemailer - The fastest way to handle email.
• emailjs - Send text/HTML emails with attachments to any SMTP server.

Filesystem

• cpy - Copy files.
• rimraf - Recursively delete files like rm -rf.