The WebAssembly Component Model is a broad-reaching architecture for building interoperable Wasm libraries, applications, and environments.

Understanding componentsBuilding componentsUsing components
Why Components?JavascriptComposing

ⓘ This documentation is aimed at users of the component model: developers of libraries and applications. Compiler and Wasm runtime developers can take a look at the Component Model specification to see how to add support for the component model to their project.


WASI 0.2.0 was released Jan 25, 2024, providing a stable release of WASI and the component model. This is a stable set of WIT definitions that components can target. WASI proposals will continue to evolve and new ones will be introduced; however, users of the component model can now pin to the stable 0.2.0 release.


If you find a mistake, omission, ambiguity, or other problem, please let us know via GitHub issues.

If you'd like to contribute content to the guide, please see the contribution guide for information on how to contribute.