node.js wrapper for the HubSpot API
https://www.npmjs.com/package/hubspot

JSforce (f.k.a. Node-Salesforce) is an isomorphic JavaScript Library utilizing Salesforce’s API: It works both in the browser and with Node.js.

It capsulates the access to various APIs provided by Salesforce in asynchronous JavaScript function calls.

It also has command line interface (CLI) which gives interactive console (REPL), so you can learn the usage without hassle.

Supported Salesforce APIs are the following:

• REST API (SOQL, SOSL, describe, etc.)
• Apex REST
• Analytics API
• Bulk API
• Chatter API
• Metadata API
• Streaming API
• Tooling API

https://www.npmjs.com/package/jsforce

A wrapper library for Zendesk using NodeJS. https://www.npmjs.com/package/zendesk-node-api

A Node.js wrapper for the WooCommerce REST API. Easily interact with the WooCommerce REST API using this library.
https://www.npmjs.com/package/woocommerce-api

Handles Authentication, includes generic methods for GET/PUT/POST/DELETE HTTP verbs. and return promises. https://www.npmjs.com/package/node-magento2

JavaScript client for Salesforce OCAPI shop api. https://www.npmjs.com/package/ocapi-client

The Mozu Node SDK provides a NodeJS API for connecting to Mozu web services. https://github.com/Mozu/mozu-node-sdk

A simple and reliable Node.js mail for sending mail through Amazon SES.
https://www.npmjs.com/package/node-ses-any-promise

Node.js client library to use the Watson Developer Cloud services, a collection of APIs that use cognitive computing to solve complex problems.
https://www.npmjs.com/package/watson-developer-cloud

A node.js Twilio helper library.
https://www.npmjs.com/package/twilio

Yelp Fusion API client for Node.js with Promises. https://www.npmjs.com/package/yelp-fusion

MQTT.js is a client library for the MQTT protocol, written in JavaScript for node.js and the browser. https://www.npmjs.com/package/mqtt

This is a node.js driver for mysql. It is written in JavaScript, does not require compiling.
https://www.npmjs.com/package/mysql

Promise-mysql is a wrapper for mysqljs/mysql that wraps function calls with Bluebird promises. Usually this would be done with Bluebird’s .promisifyAll() method, but mysqljs/mysql’s footprint is different to that of what Bluebird expects.
https://www.npmjs.com/package/promise-mysql

This is a complete and feature rich Redis client for node.js. It supports all Redis commands and focuses on high performance. https://www.npmjs.com/package/redis

Memcached promisified wrapper library. https://www.npmjs.com/package/memcached-promisify

Dashbot gives you easy access to analytics for your bot for free. https://www.npmjs.com/package/dashbot

A wrapper for the Piwik Tracking HTTP API
https://www.npmjs.com/package/piwik-tracker

This repository houses the Node SDK for Optimizely X Full Stack. https://www.npmjs.com/package/optimizely-server-sdk

A light-weight module that brings window.fetch to Node.js
https://www.npmjs.com/package/node-fetch

A library to create readable “multipart/form-data” streams. Can be used to submit forms and file uploads to other web applications.
https://www.npmjs.com/package/form-data

node-extend is a port of the classic extend() method from jQuery. It behaves as you expect. It is simple, tried and true.
https://www.npmjs.com/package/extend

A simple oauth API for node.js . This API allows users to authenticate against OAUTH providers, and thus act as OAuth consumers. It also has support for OAuth Echo, which is used for communicating with 3rd party media providers such as TwitPic and yFrog.
https://www.npmjs.com/package/oauth

Library to help you create random strings.
https://www.npmjs.com/package/randomstring

Node.js compression middleware.

The following compression codings are supported:

• deflate
• gzip

https://www.npmjs.com/package/compression

Escape RegExp special characters. https://www.npmjs.com/package/escape-string-regexp

Parse and stringify URL query strings. https://www.npmjs.com/package/query-string

A natural language date parser in Javascript, designed for extracting date information from any given text. https://www.npmjs.com/package/chrono-node

A lightweight JavaScript date library for parsing, validating, manipulating, and formatting dates. https://www.npmjs.com/package/moment

node-extend is a port of the classic extend() method from jQuery. It behaves as you expect. It is simple, tried and true. https://www.npmjs.com/package/extend

Measure the difference between two strings. https://www.npmjs.com/package/leven

A pure JavaScript implementation of the AES block cipher algorithm and all common modes of operation (CBC, CFB, CTR, ECB and OFB).
https://www.npmjs.com/package/aes-js

Request is designed to be the simplest way possible to make http calls. It supports HTTPS and follows redirects by default.
https://www.npmjs.com/package/request

The simplified HTTP request client ‘request’ with Promise support. Powered by Bluebird.
https://www.npmjs.com/package/request-promise

String::format is a small JavaScript library for formatting strings, based on Python’s str.format().
https://www.npmjs.com/package/string-format

An implementation of PHP’s strip_tags in Node.js.
https://www.npmjs.com/package/striptags

ES6 promise wrapper for xml2js
https://www.npmjs.com/package/xml2js-es6-promise