[](https://doi.org/10.5281/zenodo.4323447) # WebAssembly System Interface  The WebAssembly System Interface (WASI) is a set of APIs for WASI being developed for eventual standardization by the WASI Subgroup, which is a subgroup of the WebAssembly Community Group. WASI started with launching what is now called [Preview 1], an API using the witx IDL, and it is now widely used. Its major influences are POSIX and CloudABI. [WASI Preview 2] is now stable, and is a modular collection of APIs defined with the [Wit IDL], and it incorporates many of the lessons learned from Preview 1, including adding support for a wider range of source languages, modularity, a more expressive type system, virtualizability, and more. [Preview 1]: https://github.com/WebAssembly/WASI/tree/main/legacy/README.md [WASI Preview 2]: https://github.com/WebAssembly/WASI/blob/main/wasip2/README.md [Wit IDL]: https://github.com/WebAssembly/component-model/blob/main/design/mvp/WIT.md ## Find the APIs Development of each API happens in its own repo, which you can access from the [proposals list](docs/Proposals.md). This repo is for general discussion, as well as documenting how we work and high-level goals. ## Propose a new API If you would like to create a new proposal, get started with our [Contributing guide](CONTRIBUTING.md). All new API proposals should use the new format and the new repo structure that is shown in the [proposal template](https://github.com/WebAssembly/wasi-proposal-template). See the [Wit in WASI](docs/WitInWasi.md) document for more information about using Wit for WASI proposals.