npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2026 – Pkg Stats / Ryan Hefner

@emulatorjs/emulatorjs

v4.2.3

Published

EmulatorJS is a frontend for RetroArch in the web browser.

Readme

[![Badge License]][License]

Self-hosted Javascript emulation for various systems.

[![Button Website]][Website] [![Button Usage]][Usage] [![Button Configurator]][Configurator] [![Button Demo]][Demo] [![Button Contributors]][Contributors]

Join our Discord server:

Join our Discord server!

Or the Matrix server (#emulatorjs:matrix.emulatorjs.org):

[!NOTE]
As of EmulatorJS version 4.0, this project is no longer a reverse-engineered version of the emulatorjs.com project. It is now a complete rewrite.

[!WARNING]
As of version 4.0.9 cores and minified files are no longer included in the repository. You will need to get them separately. You can get it from releases or the * new CDN (see this for more info). There is also a new version system that we will be using. (read here for more info).

[!TIP] Cloning the repository is no longer recommended for production use. You should use releases or the CDN instead.

Ads

This project has no ads. Although, the demo page currently has an ad to help fund this project. Ads on the demo page may come and go depending on how many people are funding this project.

You can help fund this project on [patreon]

Issues

If something doesn't work, please consider opening an [Issue] with as many details as possible, as well as the console log.

3rd Party Projects

EmulatorJS itself is built to be a plugin, rather than an entire website. This is why there is no docker container of this project. However, there are several projects you can use that use EmulatorJS!

Looking for projects that integrate EmulatorJS? Check out https://emulatorjs.org/docs/3rd-party

Versioning

There are three different version names that you need to be aware of:

  1. stable - This will be the most stable version of the emulator both code and cores will be tested before release. It will be updated every time a new version is released on GitHub. This is the default version on the Demo.
  2. latest - This will contain the latest code but use the stable cores. This will be updated every time the main branch is updated.
  3. nightly - This will contain the latest code and the latest cores. The cores will be updated every day, so this is considered alpha.

CDN

EmulatorJS provides a CDN at https://cdn.emulatorjs.org/, allowing access to any version of the emulator.

To use it, set EJS_pathtodata to https://cdn.emulatorjs.org/<version>/data/, replacing <version> with stable, latest, nightly, or another main release.

Be sure to also update the loader.js path to: https://cdn.emulatorjs.org/<version>/data/loader.js

Development:

Run a local server with:

  1. Open a terminal in the root of the project.

  2. Install the dependencies with:

    npm i
  3. Start the minification with:

    node start
  4. Open your browser and go to http://localhost:8080/ to see the demo page.

Minifying

Before pushing the script files onto your production server it is recommended to minify them to save on load times as well as bandwidth.

Read the minifying documentation for more info.

Localization

If you want to help with localization, please check out the localization documentation.

>> When reporting bugs, please specify what version you are using

Nintendo

Game Boy Advance   |  Famicom / NES   |  [Virtual Boy][Virtual Boy]

Game Boy   |  SNES   |  DS   |  64

Sega

Master System   |  Mega Drive   |  Game Gear

Saturn   |  32X   |  CD

Atari

2600   |  5200   |  7800   |  Lynx   |  Jaguar

Commodore

[Commodore 64] | [Commodore 128] | [Commodore Amiga]

[Commodore PET] | [Commodore Plus/4] | [Commodore VIC-20]

Other

[PlayStation]   |  [PlayStation Portable]   |  [Arcade]    

[3DO] | [MAME 2003] | [ColecoVision]

Star History