Client-side Javascript

When writing client-side JavaScript for web sites or applications, you won't go very far before you start to use APIs (which stands for "Application Programming Interfaces," in case you were wondering). They're interfaces for manipulating different aspects of the browser and operating system the site is running on, or even data from other web sites or services. In this module, we will explore what APIs are, and how to use some of the most common APIs you'll come across often in your development work - developer.mozilla.org