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JavaScript

The language of the web — a dynamic, prototype-based language that runs in every browser and Node.js.

programming language

Quick facts

NameJavaScript

Aliasesjs, node

Typeprogramming language

Extensions.js ._js .bones .cjs .es .es6 .frag .gs

MIME type—

What is JavaScript

JavaScript

The language of the web — a dynamic, prototype-based language that runs in every browser and Node.js.

GitHub Linguist classifies JavaScript as a programming language, typically using extensions such as .js, ._js, .bones, .cjs, .es, .es6.

File extensions:

.js._js.bones.cjs.es.es6.frag.gs.jake.javascript.jsb.jscad

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Frequently asked questions

What is JavaScript mainly used for?

The language of the web — a dynamic, prototype-based language that runs in every browser and Node.js.

Which file extensions does JavaScript use?

Common extensions include .js, ._js, .bones, .cjs, .es.

Sources & standards

Updated 2026-08-18

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