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    JavaScript® (often shortened to JS) is a lightweight, interpreted, object-oriented language with first-class functions, most known as the scripting language for Web pages, but used in many non-browser environments as well such as node.js or Apache CouchDB. It is a prototype-based, multi-paradigm scripting language that is dynamic,and supports object-oriented, imperative, and functional programming styles. Read more about JavaScript.

    The JavaScript standard is ECMAScript. As of 2012, all modern browsers fully support ECMAScript 5.1. Older browsers support at least ECMAScript 3. A 6th major revision of the standard is in the works.

    This section of the site is dedicated to the JavaScript language itself, the parts that are not specific to Web pages, or other host environments. For information about APIs specific to Web pages, please see Web APIs and DOM.

    JavaScript is not to be confused with the Java programming language. JavaScript is a trademark or registered trademark of Oracle in the U.S. and other countries.


    Learn how to program JavaScript.


    Getting started
    Your first steps with JavaScript.
    JavaScript Guide
    If you are new to JavaScript, this guide will walk you through the language.
    JavaScript technologies overview
    Introduction to the web browser JavaScript landscape.
    Introduction to Object Oriented JavaScript
    Introduction to the concepts of object oriented programming in JavaScript.


    A re-introduction to JavaScript
    An overview for those who think they know about JavaScript.
    JavaScript data structures
    Overview of available data structures in JavaScript
    Equality comparisons and when to use them
    JavaScript provides three different value-comparison operations: strict equality using === and loose equality using ==.


    Inheritance and the prototype chain
    Explanation of the widely misunderstood and under-estimated prototype-based inheritance.
    Strict mode
    A restricted variant of JavaScript.
    JavaScript typed arrays
    JavaScript typed arrays provide a mechanism for accessing raw binary data.
    Memory Management
    Memory life cycle and garbage collection in JavaScript.


    Browse the complete language reference documentation.

    Get to know standard built-in objects Object, Function, Boolean, Error, Number, Math, Date, String, RegExp, Array, Map, Set, WeakMap, WeakSet, JSON, and others.
    Expressions & Operators
    Learn more about the behavior of JavaScript's operators instanceof, typeof, new, this, and more.
    Learn how do-while, for-in, for-of, try-catch, let, var, const, if-else, switch, and more JavaScript statements and keywords work.

    Tools & resources

    Helpful tools while writing and debugging your JavaScript code.

    Firefox Developer Tools
    Scratchpad, Web Console, JavaScript Profiler, Debugger, and more.
    Edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
    JavaScript Shells
    A JavaScript shell allows you to quickly test snippets of JavaScript code.
    Other JavaScript tools
    This article provides a list of additional JavaScript development tools.

    Collaboration made easy.

    Stack Overflow
    Stack Overflow questions tagged with "JavaScript".

    Join the JavaScript community

    Choose your preferred method for joining the discussion:

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