Nostalgist.js

Plans and prices

Every plan, in full

On the record

BIOS loading

BIOS files use the same resolvable-file mechanism as ROMs and are written to RetroArch’s system directory.nostalgist.js.org · read 15 Oct 2026

Bring your own content

Developers can load ROM files from their own server, which must have CORS headers configured properly.nostalgist.js.org · read 4 Oct 2026

Cheat support

The launch API documents cheat codes, but they require RetroArch 1.21.0-or-later cores that implement cheats.nostalgist.js.org · read 15 Oct 2026

Configuration

Developers can customize RetroArch and core configuration before launch.nostalgist.js.org · read 4 Oct 2026

Console helpers

Documented shortcut methods cover NES, SNES, Mega Drive, Game Boy, Game Boy Color and Game Boy Advance.nostalgist.js.org · read 15 Oct 2026

Content limitation

The project says it does not provide or encourage pirated ROM or BIOS files.nostalgist.js.org · read 4 Oct 2026

Content policy

The project says it does not provide or encourage pirated ROM or BIOS files.nostalgist.js.org · read 15 Oct 2026

Core delivery

String core names default to RetroArch Emscripten builds fetched from GitHub through jsDelivr.nostalgist.js.org · read 15 Oct 2026

CORS requirement

ROMs hosted on a developer’s server require correctly configured CORS headers.nostalgist.js.org · read 15 Oct 2026

Custom cores

Developers can provide custom JavaScript and WebAssembly core URLs or resolver functions.nostalgist.js.org · read 15 Oct 2026

Dependencies and delivery

Nostalgist.js itself does not contain emulators; by default, emulator cores are fetched from RetroArch Emscripten builds via jsDelivr.nostalgist.js.org · read 4 Oct 2026

Developer audience

The project is intended for developers building browser experiences rather than players seeking a ready-made game collection.nostalgist.js.org · read 15 Oct 2026

Distribution

Projects can install the library through npm, yarn, pnpm, or bun, or load it from CDNs including unpkg and jsDelivr.nostalgist.js.org · read 4 Oct 2026

Documentation depth

The official site provides getting-started, under-the-hood and API-reference sections with static and instance method documentation.nostalgist.js.org · read 15 Oct 2026

Emscripten access

The library exposes lower-level Emscripten interfaces, including the virtual filesystem.nostalgist.js.org · read 15 Oct 2026

Emulation engine

It simplifies launching RetroArch in a browser using a ROM and a core, without additional configuration.nostalgist.js.org · read 4 Oct 2026

Examples and integrations

The project documents a StackBlitz example and lists projects including NextCloud Nostalgist and a VS Code extension among its showcases.nostalgist.js.org · read 4 Oct 2026

Independent extension

The PyPI Sphinx extension embeds NostalgistJS in HTML documents and maps Mega Drive, NES, SNES and Game Boy families to named cores.pypi.org · read 15 Oct 2026

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