> ## Documentation Index
> Fetch the complete documentation index at: https://activepieces-feat-selfhost-appwebhooks.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Repository Structure

The repository is structured as a monorepo using the NX build system, with TypeScript as the primary language. It is divided into several packages:

```
.
├── packages
│   ├── ui
│   ├── backend
|   ├── ee
│   ├── engine
│   ├── pieces
│   ├── shared

```

* `ui`: This package contains the user interface, implemented using the Angular framework.
* `backend`: This package contains the API implementation, using the Fastify framework.
* `ee`: This package contains features that are only available in the paid edition.
* `engine`: This package contains the logic for flow execution within the sandbox.
* `pieces`: This package contains the implementation of triggers and actions for third-party apps.
* `shared`: This package contains shared data models and helper functions used by the other packages.