JavaScript Guide - JavaScript | MDN

HTML: Markup language
CSS: Styling language
JavaScript: Scripting language
Web APIs: Programming interfaces
Learn web development
Get to know MDN better
The JavaScript Guide shows you how to use JavaScript and gives an overview of the language. If you need exhaustive information about a language feature, have a look at the JavaScript reference.
This Guide is divided into the following chapters.
Overview: Introduction
Overview: Grammar and types
Overview: Control flow and error handling
Overview: Loops and iteration
Overview: Expressions and operators
Overview: Numbers and strings
Overview: Representing dates & times
Overview: Regular expressions
Overview: Indexed collections
Overview: Keyed collections
Overview: Working with objects
Overview: Using classes
Overview: Typed arrays
Overview: Iterators and generators
Overview: JavaScript resource management
Overview: Internationalization
Overview: JavaScript modules
After you have learned all fundamental features of JavaScript, you can explore some more niche features, or dive deeper into the language's mechanisms and concepts.
This page was last modified on Nov 5, 2026 by MDN contributors.
Your blueprint for a better internet.
Portions of this content are ©1998–2026 by individual mozilla.org contributors. Content available under a Creative Commons license.