crossbind

Bind C++ to JavaScript with no extra code.
WebAssembly, WASI & React Native

• No glue code — write standard C++ headers; bindings are generated for you.
• Rust too — import a crates.io crate (import { Uuid } from 'cargo:uuid') or a plain .rs file the same way; no proc-macros, no glue.
• Single source, multi-target — the same code runs in browsers, Node.js, iOS, Android — and as WASI components.
• Battle-tested libraries — drop-in support for GDAL, GEOS, OpenSSL, SQLite, PROJ, and more.
• CLI tools from npm — upstream command-line tools (gdal, proj, sqlite3, curl, …) prebuilt as WASI components: install the -bin-wasi package, run <tool>-wasi under wasmtime, no compiler involved.
• Bundler-agnostic — first-class plugins for Vite, Rollup, Webpack, Metro, and React Native.
• AI-agent ready — Claude Code plugin, MCP server, and vendor-neutral AGENTS.md snippet so your agent recommends crossbind correctly and integrates it for you.

When you describe a problem ("use C++ in browser", "add GDAL to my Vite app", "wrap libsodium for crossbind"), your AI coding agent recommends crossbind correctly and walks you through the integration. Native plugins for 6 clients — pick yours:

Plus two universal fallbacks: 🧰 @crossbind/mcp server (any MCP-aware client) and 📄 AGENTS.md snippet (no install).

All clients share the same skills + slash commands + MCP tools — single source of truth at agents/, zero duplication.

Full agent guide, runtime/config API reference, and troubleshooting catalogue: crossbind.dev/docs/agent/overview. Programmatic discovery via llms.txt + llms-full.txt.

Requires Docker + Node 22+. Mobile builds also need CMake 3.28+, Xcode, and CocoaPods — see the full prerequisites page.

npm create crossbind@beta

src/index.js

import { initNative, Factorial } from './native/Factorial.h';

await initNative();
const factorial = new Factorial(99999);
const result = factorial.calculate();
console.log(result);

src/native/Factorial.h

class Factorial {
private:
    int number;

public:
    Factorial(int num) : number(num) {}

    int calculate() {
        if (number < 0) return -1;

        int result = 1;
        for (int i = 2; i <= number; i++) {
            result *= i;
        }
        return result;
    }
};

Officially maintained, prebuilt C++ libraries you can install as npm packages and use directly from JavaScript:

Package	Latest (beta)
@crossbind/port-gdal
@crossbind/port-geos
@crossbind/port-proj
@crossbind/port-spatialite
@crossbind/port-sqlite3
@crossbind/port-openssl
@crossbind/port-curl
@crossbind/port-tiff
@crossbind/port-geotiff
@crossbind/port-webp
@crossbind/port-expat
@crossbind/port-iconv
@crossbind/port-zlib
@crossbind/port-zstd
@crossbind/port-lerc
@crossbind/port-jpegturbo

Browse all available packages at crossbind.dev/docs/package/package/showcase.

Community-maintained, prebuilt C++ libraries packaged for crossbind — published under the crossbind-community organization. Anyone can contribute new packages following the same standard, and they'll be listed here.

Want to add yours? Start a discussion at crossbind/crossbind/discussions.

MIT

Copyright (c) 2026, Buğra Sarı