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Wasm 2.0 Completed Published on March 20, 2025 by Andreas Rossberg. As of last December, release 2.0 of the Wasm specification is “official”! If you have been following the developments of the Wasm standard, then version 2.0 may sound like rather old news to you. And indeed, the Wasm Community and Working Groups had reached consensus and finished the specification in early 2022. All major implemen

Security The security model of WebAssembly has two important goals: (1) protect users from buggy or malicious modules, and (2) provide developers with useful primitives and mitigations for developing safe applications, within the constraints of (1). Users Each WebAssembly module executes within a sandboxed environment separated from the host runtime using fault isolation techniques. This implies:

I want to… Compile a WebAssembly module from… (This list is in alphabetical order.) Ada AssemblyScript (a TypeScript-like syntax) C/C++ starting from scratch library that I want to port to the Web C# Cobol D Dart via Flutter F# Go with full language support targeting minimal size Grain Haskell GHC WebAssembly backend Asterius Java TeaVM j2wasm Kotlin Lua Moonbit Pascal PHP Python Pyodide Nuitka (p

Understanding the JS API We assume here that you already have a .wasm module, whether compiled from a C/C++ program or assembled directly from s-exprs. Loading and running While there are future plans to allow WebAssembly modules to be loaded just like ES6 modules (using <script type='module'>), WebAssembly must currently be loaded and compiled by JavaScript. For basic loading, there are three ste

WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable compilation target for programming languages, enabling deployment on the web for client and server applications. Developer reference documentation for Wasm can be found on MDN's WebAssembly pages. The open standards for WebAssembly are developed in a W3C Community Group (