JSNES vs Nesalizer
JSNES
github.comNesalizer
github.comSide by side
| Figure | JSNES | Nesalizer |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | — | Yes |
| Linux | Yes | Yes |
| Plans published | 1 | 0 |
| Spec score · NES Emulators | 8.3 (#3) | 7.1 (#17) |
| Audio | The API supports an audio callback and has sound emulation enabled by default with a default sample rate of 48000 Hz. | During rewind, audio is added in reverse from the end of the audio buffer. |
| License | The repository identifies its license as Apache-2.0. | The project is licensed under GPLv2. |
| Purpose | JSNES is a JavaScript NES emulator library that works in browsers and Node.js. | Nesalizer is a work-in-progress NES emulator with real-time rewind that correctly reverses sound. |
| Save states | The API can serialize emulator state with toJSON() and restore it with fromJSON(). | Save states are in memory and are not saved to disk; persistent on-disk save states are listed as missing. |
Plans
In their own words
JSNES
JSNES is a free JavaScript library for emulating NES games in browsers and Node.js. Its Browser helper handles canvas rendering, audio, keyboard and gamepad input, and frame timing; the lower-level NES class allows custom rendering and audio handling in Node.js. ROM data can be loaded from a URL or from a string, Uint8Array, or ArrayBuffer. The API runs frames, accepts controller input for either player, resets, adjusts frame rate, and includes methods for moving and triggering the Zapper. Applications can serialize and restore emulator state with `toJSON()` and `fromJSON()`. The `onBatteryRamWrite` callback lets an application capture battery-backed SRAM writes for persistent game saves. Sound emulation is enabled by default, with a default sample rate of 48000 Hz, and an audio callback is available. The README provides npm installation for Node.js or Webpack and an unpkg script for browser use, as well as a React embedding example. JSNES is licensed under Apache-2.0; its GitHub Issues tracker accepts bug reports and feature requests.