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 • 🇰🇷 한국어 -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 binstall

  cargo binstall 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	wasm.h header	Learn
	C++	wasm.hh 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	no published package
	Julia	no published package
	V	no published package
	OCaml	wasmer OCaml package

👋  Missing a language?

Contribute

We appreciate your help! 💜

We recommend reading the following guide on how to contribute into a complex project successfully: https://mitchellh.com/writing/contributing-to-complex-projects

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