A JavaScript NES emulator.
Alternatives To Jsnes
Project NameStarsDownloadsRepos Using ThisPackages Using ThisMost Recent CommitTotal ReleasesLatest ReleaseOpen IssuesLicenseLanguage
Jsnes5,6531023 months ago7August 24, 202164apache-2.0JavaScript
A JavaScript NES emulator.
a month ago258otherC
iOS & tvOS multi-emulator frontend, supporting various Atari, Bandai, NEC, Nintendo, Sega, SNK and Sony console systems… Get Started: https://wiki.provenance-emu.com |
Nes5,15545 months ago1January 27, 202110mitGo
NES emulator written in Go.
2 days ago328gpl-3.0Kotlin
All in one emulator on Android!
3 months ago10apache-2.0Rust
An NES emulator written in Rust
Php Terminal Nes Emulator651
8 months agomitPHP
A PHP terminal NES emulator
a year ago1Rust
The NES (emulator) you left outside in the rain but let dry and still kind of works
Gym Super Mario Bros496
2a year ago96June 21, 20224otherPython
An OpenAI Gym interface to Super Mario Bros. & Super Mario Bros. 2 (Lost Levels) on The NES
Jsnes Web479
10 months ago44apache-2.0JavaScript
A browser UI for JSNES, a JavaScript NES emulator
13 days ago1bsd-3-clauseHaskell
:video_game: NES Emulator written in Haskell
Alternatives To Jsnes
Select To Compare

Alternative Project Comparisons


A JavaScript NES emulator.

It's a library that works in both the browser and Node.js. The browser UI is available at bfirsh/jsnes-web.


For Node.js or Webpack:

$ npm install jsnes

(Or yarn add jsnes.)

In the browser, you can use unpkg:

<script type="text/javascript" src="https://unpkg.com/jsnes/dist/jsnes.min.js"></script>


// Initialize and set up outputs
var nes = new jsnes.NES({
  onFrame: function(frameBuffer) {
    // ... write frameBuffer to screen
  onAudioSample: function(left, right) {
    // ... play audio sample

// Read ROM data from disk (using Node.js APIs, for the sake of this example)
const fs = require('fs');
var romData = fs.readFileSync('path/to/rom.nes', {encoding: 'binary'});

// Load ROM data as a string or byte array

// Run frames at 60 fps, or as fast as you can.
// You are responsible for reliable timing as best you can on your platform.
// ...

// Hook up whatever input device you have to the controller.
nes.buttonDown(1, jsnes.Controller.BUTTON_A);
nes.buttonUp(1, jsnes.Controller.BUTTON_A);
// ...


To build a distribution:

$ yarn run build

This will create dist/jsnes.min.js.

Running tests

$ yarn test

Embedding JSNES in a web page

You can use JSNES to embed a playable version of a ROM in a web page. This is handy if you are a homebrew ROM developer and want to put a playable version of your ROM on its web page.

The best implementation is jsnes-web but unfortunately it is not trivial to reuse the code. You'll have to copy and paste the code from that repository, the use the <Emulator> React component. Here is a usage example..

A project for potential contributors (hello!): jsnes-web should be reusable and on NPM! It just needs compiling and bundling.

A more basic example is in the example/ directory of this repository. Unfortunately this is known to be flawed, and doesn't do timing and sound as well as jsnes-web.

Formatting code

All code must conform to Prettier formatting. The test suite won't pass unless it does.

To automatically format all your code, run:

$ yarn run format


JSNES is based on James Sanders' vNES, and owes an awful lot to it. It also wouldn't have happened without Matt Wescott's JSSpeccy, which sparked the original idea. (Ben, circa 2008: "Hmm, I wonder what else could run in a browser?!")

Popular Rom Projects
Popular Nes Emulator Projects
Popular Hardware Categories
Related Searches

Get A Weekly Email With Trending Projects For These Categories
No Spam. Unsubscribe easily at any time.
Nes Emulator