Wasmer Has a Free Registry — Share and Run WebAssembly Packages Like npm for WASM

WebAssembly Has a Package Manager Now

Wasmer Registry (wapm.io) lets you publish and install WebAssembly packages. Run any WASM binary from the command line. Free and open-source.

Setup

curl https://get.wasmer.io -sSfL | sh

Run Packages Instantly

# Run Python in WASM
wasmer run python/python -- -c "print(42 * 42)"

# Run SQLite
wasmer run syrusakbary/sqlite -- test.db "CREATE TABLE users (id INT, name TEXT)"

# Run ffmpeg
wasmer run nicholasgasior/ffmpeg -- -i input.mp4 output.mp3

No installation. No dependencies. Just WASM.

Publish a Package

# Build your Rust/C/Go code to WASM
cargo build --target wasm32-wasi

# Create wasmer.toml
wasmer init

# Publish
wasmer publish

Use WASM in JavaScript

import { init, WASI } from "@wasmer/wasi";

await init();
const wasi = new WASI({ args: [], env: {} });
const response = await fetch("https://registry.wasmer.io/packages/my-package/my-pkg.wasm");
const module = await WebAssembly.compile(await response.arrayBuffer());
const instance = wasi.instantiate(module, {});
instance.exports._start();

Why WASM Matters

• Run any language in the browser (Rust, C, Go, Python)
• Near-native performance
• Sandboxed execution (secure by default)
• Cross-platform (browser, server, edge, IoT)
• Docker alternative for lightweight containers

WASM vs Docker

Feature	WASM	Docker
Startup	Microseconds	Seconds
Size	KBs-MBs	MBs-GBs
Sandbox	Built-in	Needs config
Cross-platform	Universal	Linux-native
Use case	Functions, plugins	Full apps

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