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.js

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JavaScript

Source for the language that runs the web — in browsers and on servers (Node.js, Bun, Deno). Central to interactive UIs and modern tooling.

MIME types

  • text/javascript
  • application/javascript

Category

web

Aliases

.mjs / .cjs

What opens this file

  • VS Code
  • WebStorm
  • Sublime Text
  • Browsers / Node.js

How to open by OS

Windows

  • Browsers, Node.js, Bun, Deno.

Mac

  • Same.

Linux

  • Same.

Ios

  • Working Copy, Koder.

Android

  • Acode, Termux.

Safety notes

  • Loading untrusted scripts exposes users to XSS. Combine CSP with Subresource Integrity (SRI) when hotlinking.
  • Careless npm installs can run arbitrary install-time scripts — verify package provenance and maintainers.

Common mistakes

  • Code written for the browser and for Node.js is not always interchangeable (import vs require). Configure a bundler target explicitly.
  • Mixing .mjs and .cjs in the same tree makes Node.js emit module-resolution warnings.

Related extensions

References