Extism - the WebAssembly framework [![Discord](https://img.shields.io/discord/1011124058408112148?color=%23404eed&label=Community%20Chat&logo=Discord&logoColor=%23404eed)](https://extism.org/discord) ![GitHub Org's stars](https://img.shields.io/github/stars/extism) ![Downloads](https://img.shields.io/crates/d/extism-manifest) ![GitHub License](https://img.shields.io/github/license/extism/extism) ![GitHub release (with filter)](https://img.shields.io/github/v/release/extism/extism)
# Overview Extism is a lightweight framework for building with WebAssembly (Wasm). It supports running Wasm code on servers, the edge, CLIs, IoT, browsers and everything in between. Extism is designed to be "universal" in that it supports a common interface, no matter where it runs. > **Note:** One of the primary use cases for Extism is **building extensible > software & plugins**. You want to be able to execute arbitrary, untrusted code > from your users? Extism makes this safe and practical to do. Additionally, Extism adds some extra utilities on top of standard Wasm runtimes. For example, we support persistent memory/module-scope variables, secure & host-controlled HTTP without WASI, runtime limiters & timers, simpler host function linking, and more. Extism users build: - plug-in systems - FaaS platforms - code generators - web applications - & much more... # Run WebAssembly In Your App Pick a SDK to import into your program, and refer to the documentation to get started: | Type | Language | Source Code | Package | | ----------- | ---------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- | | Rust SDK | Rust SDK | https://github.com/extism/extism/tree/main/runtime | [Crates.io](https://crates.io/crates/extism) | | JS SDK | JS SDK | https://github.com/extism/js-sdk
(supports Web, Node, Deno & Bun!) | [NPM](https://www.npmjs.com/package/@extism/extism) | | Elixir SDK | Elixir SDK | https://github.com/extism/elixir-sdk | [Hex](https://hex.pm/packages/extism) | | Go SDK | Go SDK | https://github.com/extism/go-sdk | [Go mod](https://pkg.go.dev/github.com/extism/go-sdk) | | Haskell SDK | Haskell SDK | https://github.com/extism/haskell-sdk | [Hackage](https://hackage.haskell.org/package/extism) | | Java SDK | Java SDK | https://github.com/extism/java-sdk | [Sonatype](https://central.sonatype.com/artifact/org.extism.sdk/extism) | | .NET SDK | .NET SDK | https://github.com/extism/dotnet-sdk
(supports C# & F#!) | [Nuget](https://www.nuget.org/packages/Extism.Sdk) | | OCaml SDK | OCaml SDK | https://github.com/extism/ocaml-sdk | [opam](https://opam.ocaml.org/packages/extism/) | | Perl SDK | Perl SDK | https://github.com/extism/perl-sdk | [CPAN](https://metacpan.org/pod/Extism) | | PHP SDK | PHP SDK | https://github.com/extism/php-sdk | [Packagist](https://packagist.org/packages/extism/extism) | | Python SDK | Python SDK | https://github.com/extism/python-sdk | [PyPi](https://pypi.org/project/extism/) | | Ruby SDK | Ruby SDK | https://github.com/extism/ruby-sdk | [RubyGems](https://rubygems.org/gems/extism) | | Zig SDK | Zig SDK | https://github.com/extism/zig-sdk | N/A | | C SDK | C SDK | https://github.com/extism/extism/tree/main/libextism | N/A | | C++ SDK | C++ SDK | https://github.com/extism/cpp-sdk | N/A | # Compile WebAssembly to run in Extism Hosts Extism Hosts (running the SDK) must execute WebAssembly code that has a [PDK, or Plug-in Development Kit](https://extism.org/docs/concepts/pdk), library compiled in to the `.wasm` binary. PDKs make it easy for plug-in / extension code authors to read input from the host and return data back, read provided configuration, set/get variables, make outbound HTTP calls if allowed, and more. Pick a PDK to import into your Wasm program, and refer to the documentation to get started: | Type | Language | Source Code | Package | | ------------------ | ---------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------- | --------------------------------------------------------- | | Rust PDK | Rust PDK | https://github.com/extism/rust-pdk | [Crates.io](https://crates.io/crates/extism-pdk) | | JS PDK | JS PDK | https://github.com/extism/js-pdk | N/A | | Go PDK | Go PDK | https://github.com/extism/go-pdk | [Go mod](https://pkg.go.dev/github.com/extism/go-pdk) | | Haskell PDK | Haskell PDK | https://github.com/extism/haskell-pdk | [Hackage](https://hackage.haskell.org/package/extism-pdk) | | AssemblyScript PDK | AssemblyScript PDK | https://github.com/extism/assemblyscript-pdk | [NPM](https://www.npmjs.com/package/@extism/as-pdk) | | .NET PDK | .NET PDK | https://github.com/extism/dotnet-pdk
(supports C# & F#!) | https://www.nuget.org/packages/Extism.Pdk | | C PDK | C PDK | https://github.com/extism/c-pdk | N/A | | Zig PDK | Zig PDK | https://github.com/extism/zig-pdk | N/A | # Support ## Discord If you experience any problems or have any questions, please join our [Discord](https://extism.org/discord) and let us know. Our community is very responsive and happy to help get you started. ## Usage Head to the [project website](https://extism.org) for more information and docs. Also, consider reading an [overview](https://extism.org/docs/overview) of Extism and its goals & approach. ## Contribution Thank you for considering a contribution to Extism, we are happy to help you make a PR or find something to work on! The easiest way to start would be to join the [Discord](https://extism.org/discord) or open an issue on the [`extism/proposals`](https://github.com/extism/proposals) issue tracker, which can eventually become an Extism Improvement Proposal (EIP). For more information, please read the [Contributing](https://extism.org/docs/concepts/contributing) guide. --- ## Who's behind this? Extism is an open-source product from the team at:

_Reach out and tell us what you're building! We'd love to help:_ hello@dylibso.com