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Wasmer is a runtime that enables super lightweight containers based on WebAssembly to run anywhere: from Desktop to the Cloud and IoT devices, and also embedded in numerous programming language.

This document is also available in: 🇨🇳 中 文 -Chinese, 🇪🇸 Español-Spanish, 🇫🇷 Français-French, 🇯🇵 日本 語 -Japanese.

✨ Features

• Fast & Safe. Wasmer runs WebAssembly at near-native speed in a fully sandboxed environment.

• Pluggable. To best suit your needs, Wasmer supports different compilation strategies (aka the compilers — based on LLVM, based on Cranelift, or Singlepass) and artifact strategies (aka the engines — Universal, Dylib, Staticlib).

• Universal. You can run Wasmer on any platform (Linux, macOS and Windows) and chipset.

• Standards compliant. The runtime passes official WebAssembly test suite supporting WASI and Emscripten.

🏁 Quickstart

The quickest way to get fun with Wasmer is to install its CLI. It ships with no dependency. Let's first start by installing it, then let's see how to execute a WebAssembly file.

Installing the Wasmer CLI

Wasmer can be installed from various package managers, scripts, or built from sources… Pick what is best for you:

• With curl

  This is kind of the universal way to install Wasmer. If you don't trust this approach, please see other installation options.

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

• With PowerShell

  This installation process is dedicated to Windows users:

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

• With Homebrew

  Homebrew is mainly a package manager for macOS:

  brew install wasmer

• With Scoop

  Scoop is a package manager for Windows:

  scoop install wasmer

• With Chocolatey

  Chocolatey is a package manager for Windows:

  choco install wasmer

• With Cargo

  Cargo is the crate installer for Rust.

  The following command will install wasmer-cli. All the available features are described in the wasmer-cli documentation.

  cargo install wasmer-cli

• From source

  Inside the root of this repository (in this case, you're likely to need some dependencies):

  make build-wasmer

  Read the documentation to learn more about this approach.

• More installation options? See the wasmer-install repository to learn more!

Executing a WebAssembly file

After installing Wasmer you should be ready to execute your first WebAssembly file! 🎉

You can start by running QuickJS, which is 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

Discover

Here are some clues about 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_wasm.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

👋 Missing a language?

🤲 Contribute

We welcome any form of contribution, especially from new members of our community 💜. You can check how to build the Wasmer runtime documentation from sources!

Testing

Test you want? The Wasmer docs will show you how.

👐 Community

Wasmer has an amazing community of developers and contributors. You are very welcome! 👋

Channels

• Community Slack workspace,
• Official Twitter account,
• Official Facebook acount,
• Email.