| https://github.com/extism/extism/tree/main/runtime | [Crates.io](https://crates.io/crates/extism) |
| JS SDK | 
| https://github.com/extism/js-sdk 
| https://github.com/extism/elixir-sdk | [Hex](https://hex.pm/packages/extism) |
| Go SDK | 
| https://github.com/extism/go-sdk | [Go mod](https://pkg.go.dev/github.com/extism/go-sdk) |
| Haskell SDK | 
| https://github.com/extism/haskell-sdk | [Hackage](https://hackage.haskell.org/package/extism) |
| Java SDK | 
| https://github.com/extism/java-sdk | [Sonatype](https://central.sonatype.com/artifact/org.extism.sdk/extism) |
| .NET SDK | 
| https://github.com/extism/dotnet-sdk 
| https://github.com/extism/ocaml-sdk | [opam](https://opam.ocaml.org/packages/extism/) |
| Perl SDK | 
| https://github.com/extism/perl-sdk | [CPAN](https://metacpan.org/pod/Extism) |
| PHP SDK | 
| https://github.com/extism/php-sdk | [Packagist](https://packagist.org/packages/extism/extism) |
| Python SDK | 
| https://github.com/extism/python-sdk | [PyPi](https://pypi.org/project/extism/) |
| Ruby SDK | 
| https://github.com/extism/ruby-sdk | [RubyGems](https://rubygems.org/gems/extism) |
| Zig SDK | 
| https://github.com/extism/zig-sdk | N/A |
| C SDK | 
| https://github.com/extism/extism/tree/main/libextism | N/A |
| 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 | | https://github.com/extism/rust-pdk | [Crates.io](https://crates.io/crates/extism-pdk) |
| JS PDK | | https://github.com/extism/js-pdk | N/A |
| Python PDK | | https://github.com/extism/python-pdk | N/A |
| Go PDK | | https://github.com/extism/go-pdk | [Go mod](https://pkg.go.dev/github.com/extism/go-pdk) |
| Haskell PDK | | https://github.com/extism/haskell-pdk | [Hackage](https://hackage.haskell.org/package/extism-pdk) |
| AssemblyScript PDK | 
| https://github.com/extism/assemblyscript-pdk | [NPM](https://www.npmjs.com/package/@extism/as-pdk) |
| .NET PDK | | https://github.com/extism/dotnet-pdk | https://github.com/extism/c-pdk | N/A |
| C++ PDK | | https://github.com/extism/cpp-pdk | N/A |
| Zig PDK | | https://github.com/extism/zig-pdk | N/A |
# Generating Bindings
It's often very useful to define a schema to describe the function signatures
and types you want to use between Extism SDK and PDK languages.
[XTP Bindgen](https://github.com/dylibso/xtp-bindgen) is an open source
framework to generate PDK bindings for Extism plug-ins. It's used by the
[XTP Platform](https://www.getxtp.com/), but can be used outside of the platform
to define any Extism compatible plug-in system.
## 1. Install the `xtp` CLI.
See installation instructions
[here](https://docs.xtp.dylibso.com/docs/cli#installation).
## 2. Create a schema using our OpenAPI-inspired IDL:
```yaml
version: v1-draft
exports:
CountVowels:
input:
type: string
contentType: text/plain; charset=utf-8
output:
$ref: "#/components/schemas/VowelReport"
contentType: application/json
# components.schemas defined in example-schema.yaml...
```
> See an example in [example-schema.yaml](./example-schema.yaml), or a full
> "kitchen sink" example on
> [the docs page](https://docs.xtp.dylibso.com/docs/concepts/xtp-schema/).
## 3. Generate bindings to use from your plugins:
```
xtp plugin init --schema-file ./example-schema.yaml
> 1. TypeScript
2. Go
3. Rust
4. Python
5. C#
6. Zig
7. C++
8. GitHub Template
9. Local Template
```
This will create an entire boilerplate plugin project for you to get started
with. Implement the empty function(s), and run `xtp plugin build` to compile
your plugin.
> For more information about XTP Bindgen, see the
> [dylibso/xtp-bindgen](https://github.com/dylibso/xtp-bindgen) repository and
> the official
> [XTP Schema documentation](https://docs.xtp.dylibso.com/docs/concepts/xtp-schema).
# 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:
