Wasmer is a fast and secure WebAssembly runtime that enables super lightweight containers to run anywhere: from Desktop to the Cloud, Edge and IoT devices.

This document is also available in: 🇨🇳 中 文 -Chinese • 🇩🇪 Deutsch-German • 🇪🇸 Español-Spanish • 🇫🇷 Français-French • 🇯🇵 日本 語 -Japanese • 🇰🇷 한국인 -Korean.

Features

• Secure by default. No file, network, or environment access, unless explicitly enabled.
• Supports WASI and Emscripten out of the box.
• Fast. Run WebAssembly at near-native speeds.
• Embeddable in multiple programming languages
• Compliant with latest WebAssembly Proposals (SIMD, Reference Types, Threads, ...)

Install

Wasmer CLI ships as a single executable with no dependencies.

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

Other installation options (Powershell, Brew, Cargo, ...)

Wasmer can be installed from various package managers. Choose the one that fits best for your environment:

• Powershell (Windows)

  iwr https://win.wasmer.io -useb | iex

• Homebrew (macOS, Linux)

  brew install wasmer

• Scoop (Windows)

  scoop install wasmer

• Chocolatey (Windows)

  choco install wasmer

• Cargo

  Note: All the available features are described in the wasmer-cli crate docs

  cargo install wasmer-cli

Looking for more installation options? See the wasmer-install repository to learn more!

Quickstart

You can start by running QuickJS, a small and embeddable Javascript engine compiled as a WebAssembly module (qjs.wasm):

$ wasmer qjs.wasm
QuickJS - Type "\h" for help
qjs > const i = 1 + 2;
qjs > console.log("hello " + i);
hello 3

Here is what you can do next:

• Use Wasmer from your Rust application
• Publish a Wasm package on WAPM
• Read more about Wasmer

📦 Language Integrations

The Wasmer runtime can be used as a library embedded in different languages, so you can use WebAssembly anywhere.

	Language	Package	Documentation
	Rust	wasmer Rust crate	Learn
	C/C++	wasmer.h header	Learn
	C#	WasmerSharp NuGet package	Learn
	D	wasmer Dub package	Learn
	Python	wasmer PyPI package	Learn
	Javascript	@wasmerio NPM packages	Learn
	Go	wasmer Go package	Learn
	PHP	wasm PECL package	Learn
	Ruby	wasmer Ruby Gem	Learn
	Java	wasmer/wasmer-jni Bintray package	Learn
	Elixir	wasmex hex package	Learn
	R	no published package	Learn
	Postgres	no published package	Learn
	Swift	no published package
	Zig	no published package
	Dart	wasm pub package
	Crystal	no published package	Learn
	Lisp	under heavy development - no published package

👋  Missing a language?

Contribute

We appreciate your help! 💜

Check our docs on how to build Wasmer from source or test your changes.

Community

Wasmer has an amazing community of developers and contributors. Welcome, please join us! 👋

• Wasmer Community Slack
• Wasmer on Twitter
• Wasmer on Facebook
• Email