Node js API Tutorial for Beginners Building API using NodeJS
Learn Node.js - Node.js API Development for Beginners, you'll learn the core fundamentals of NodeJS so that you can start building API using NodeJS. You will learn Modern JavaScript, NodeJS event loop, Asynchronous programming, using node modules, npm modules and creating your own modules, creating server, connect to database and sending json responses.
Google’s Go Essentials For Node.js / JavaScript Developers