Learn about JavaScript Object Notation and JSON objects and arrays, including how and why they're used. Also, find out how JSON compares to HTML and XML.

Built-in JavaScript objects and functions are ones you'll use all the time. Here's how to use Object, JSON, String, Math, Date, and console in your JavaScript programs.

JavaScript can be a boon if used with care—or a bane if used recklessly. Here are the 10 JavaScript concepts you’ll need to write scalable code in Node.js.