Feb 02, 2026 08:00:00

'EmulatorJS' allows you to easily embed a game emulator on your website

' EmulatorJS ' is a web-based front-end for RetroArch that allows you to easily embed the emulator '

RetroArch ' on your website. EmulatorJS is primarily developed using JavaScript, with 91.1% of the entire program being composed of JavaScript. It is released under the open source GPL-3.0 license.

Home · EmulatorJS
https://emulatorjs.org/

Introduction · EmulatorJS
https://emulatorjs.org/docs

EmulatorJS/EmulatorJS: A web-based frontend for RetroArch
https://github.com/EmulatorJS/EmulatorJS

EmulatorJS is developed by a community led by ethanaobrien and allancoding, and the latest version, 4.2.3 , was released in July 2025.

EmulatorJS's greatest feature is its ease of implementation; you can install the emulator on your site with just a few lines of code. It also comes with a dedicated editor that automatically generates embedding code, making it easy to use even for users who aren't familiar with programming. It also supports multiple languages, and the appearance and functionality can be fully customized using built-in options.

Below is an example of EmulatorJS running the SNES demo ROM ' Mode 7 Interactive Demo ,' which is available in the public domain.

In terms of operation, it is recommended to use the official CDN or release version rather than copying files directly from GitHub. When using a CDN, you can choose from different versions: 'stable,' which guarantees stable operation; 'latest,' which includes the latest features; or 'nightly,' a development version that is updated daily. Furthermore, version 4.0 and later is a completely new system that has been rewritten from scratch, rather than being built by analyzing past projects.

It supports a wide range of systems, including Nintendo's Game Boy, Super Famicom, Nintendo DS, Nintendo 64, Sega's Mega Drive and Game Gear, as well as Sony's PSP and arcade games. It can also run many retro computer systems, including Atari and Commodore.

EmulatorJS itself does not contain any ads and is free for anyone to use, but ads may be displayed on the demo page to raise funds for continued development.

A demo of EmulatorJS is available at the following website:

EmulatorJS | Demo
https://demo.emulatorjs.org/