WebAssembly is a type of code that can be run in modern web browsers. It is a low-level assembly-like language with a compact binary format that runs with near-native performance and provides languages such as C/C++, C# and Rust with a compilation target so that they can run on the web. It is also designed to run alongside JavaScript, allowing both to work together.
WebAssembly is designed to complement and run alongside JavaScript â using the WebAssembly JavaScript APIs, you can load WebAssembly modules into a JavaScript app and share functionality between the two. This allows you to take advantage of WebAssembly's performance and power and JavaScript's expressiveness and flexibility in the same app, even if you don't know how to write WebAssembly code.
WebAssembly has big implications for the web platform, not only because it provides a way for code written in multiple languages to run on the web at near-native speed, but also because it enables client apps to run on the web that previously could not.
And what's even better is that it is being developed as a web standard via the W3C WebAssembly Working Group and Community Group with active participation from all major browser vendors.
GuidesThe WebAssembly guides cover topics such as high-level concepts, compiling from different languages, the textual representation of the Wasm binary format, and how to run WebAssembly.
Get started by reading the high-level concepts behind WebAssembly â what it is, why it is so useful, how it fits into the web platform (and beyond), and how to use it.
When you've written code in C/C++, you can then compile it into Wasm using a tool like Emscripten. Let's look at how it works.
A core use-case for WebAssembly is to take the existing ecosystem of C libraries and allow developers to use them on the web.
If you've written some Rust code, you can compile it into WebAssembly! This tutorial takes you through all you need to know to compile a Rust project to Wasm and use it in an existing web app.
After you have a Wasm module, this article covers how to fetch, compile and instantiate it, combining the WebAssembly JavaScript API with the Fetch or XHR APIs.
Once you've loaded a Wasm module, you'll want to use it. In this article, we show you how to use WebAssembly via the WebAssembly JavaScript API.
Exported WebAssembly functions are the JavaScript reflections of WebAssembly functions, which allow calling WebAssembly code from JavaScript. This article describes what they are.
This article explains the Wasm text format. This is the low-level textual representation of a Wasm module shown in browser developer tools when debugging.
This article provides a guide on how to convert a WebAssembly module written in text format into a Wasm binary.
Reference documentation with interactive samples for the set of WebAssembly operators.
This object acts as the namespace for all WebAssembly-related functionality.
WebAssembly.Global()
A WebAssembly.Global object represents a global variable instance, accessible from both JavaScript and importable/exportable across one or more WebAssembly.Module instances. This allows dynamic linking of multiple modules.
WebAssembly.Module()
A WebAssembly.Module object contains stateless WebAssembly code that has already been compiled by the browser and can be efficiently shared with Workers, and instantiated multiple times.
WebAssembly.Instance()
A WebAssembly.Instance object is a stateful, executable instance of a Module. Instance objects contain all the Exported WebAssembly functions that allow calling into WebAssembly code from JavaScript.
WebAssembly.compile()
The WebAssembly.compile() function compiles WebAssembly binary code into a WebAssembly.Module object.
WebAssembly.compileStreaming()
The WebAssembly.compileStreaming() function compiles a WebAssembly.Module directly from a streamed underlying source.
WebAssembly.instantiate()
The WebAssembly.instantiate() function allows you to compile and instantiate WebAssembly code.
WebAssembly.instantiateStreaming()
The WebAssembly.instantiateStreaming() function is the primary API for compiling and instantiating WebAssembly code, returning both a Module and its first Instance.
WebAssembly.validate()
The WebAssembly.validate() function validates a given typed array of WebAssembly binary code.
WebAssembly.Memory()
A WebAssembly.Memory object is a resizable ArrayBuffer that holds the raw bytes of memory accessed by an Instance.
WebAssembly.Table()
A WebAssembly.Table object is a resizable typed array of opaque values, like function references, that are accessed by an Instance.
WebAssembly.Tag()
The WebAssembly.Tag object defines a type of WebAssembly exception that can be thrown to/from WebAssembly code.
WebAssembly.Exception()
The WebAssembly.Exception object represents a runtime exception thrown from WebAssembly to JavaScript, or thrown from JavaScript to a WebAssembly exception handler.
WebAssembly.CompileError()
Creates a new WebAssembly CompileError object.
WebAssembly.LinkError()
Creates a new WebAssembly LinkError object.
WebAssembly.RuntimeError()
Creates a new WebAssembly RuntimeError object.
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