# Extension Before Uninstall

<!-- meta: type=event-onExtensionBeforeUninstall; location=Joomla Events › Extension Events; category=Trigger; platforms=Joomla -->

## Overview

Extension Before Uninstall is a **Trigger** in **Joomla Events › Extension Events**. Before an extension is uninstalled.

Last chance to preserve data or block uninstall.

Each run also includes who was logged in at the time and what kind of item was involved — see audit_user and audit_type in Payload Fields below.

This trigger is not connected yet — flows using it will not run until JOrchestrator adds support for this Joomla hook.

When this trigger fires, JOrchestrator starts the flow and passes the incoming event or request data to the next connected step. Configure filtering, payload shape, and security on the **Design** tab.

## Why use this node

Extension Before Uninstall is a **trigger** in the **Joomla Events › Extension Events** group. Triggers start a flow. They listen for an external signal — a CMS event, inbound HTTP call, payment notification, or schedule — and pass the incoming data to the first downstream step.

Typical reasons teams add **Extension Before Uninstall** to a flow:

- Automate backend work when Joomla fires `ExtensionBeforeUninstall`
- Notify administrators or sync external systems on this CMS lifecycle event
- Enrich or validate CMS data before it is persisted
- Audit user, content, or extension activity without custom plugins

## When it runs

Before an extension is uninstalled.

## Example workflows

Common patterns on the canvas:

1. **Extension Before Uninstall** → **Send Notification** (admin alert)
2. **Extension Before Uninstall** → **Insert Row** (audit log)
3. **Extension Before Uninstall** → **If** → **Send Email** / **Update Article**

## Properties panel

The designer shows these tabs for this node:

| Tab | Purpose |
|-----|---------|
| **Info** | Plain-language description and output payload fields for downstream steps |
| **Design** | Trigger configuration and payload schema |

### System (automatic — not edited by the user)

These fields are managed by the designer or runtime — you do not type into them directly:

| Property key | Label | Type | Required | Visible when | Notes |
|--------------|-------|------|----------|--------------|-------|
| `_nodeId` | Node ID | `node-id` | No | — | — |

### User-configured — General tab

| Property key | Label | Type | Required | Visible when | Notes |
|--------------|-------|------|----------|--------------|-------|
| `label` | Label | `text` | No | — | Node label |

### CMS site configuration (not on this node's properties panel)

Credentials, API keys, mailers, SMTP, and integration defaults are configured in the CMS plugin under **Node Configuration**, not per step on this node. Link the flow to a domain before testing CMS-backed fields.

## Output payload fields

After this step runs, later nodes can reference these fields using placeholders such as
`{{extension_before_uninstall.context}}`.

| Field key | Type | Description |
|-----------|------|-------------|
| `context` | string | Joomla event context string. |
| `subject` | object | Email or notification subject line. |
| `package.type` | string | Nested field "package.type" from this node's output payload. |
| `package.dir` | string | Nested field "package.dir" from this node's output payload. |
| `package.packagefile` | string | Nested field "package.packagefile" from this node's output payload. |
| `package.extractdir` | string | Nested field "package.extractdir" from this node's output payload. |
| `installerResult` | boolean | Boolean flag from this node's output. |
| `message` | string | Human-readable status, error, or result summary. |
| `audit_user.id` | number | Nested field "audit_user.id" from this node's output payload. |
| `audit_user.username` | string | Nested field "audit_user.username" from this node's output payload. |
| `audit_user.email` | string | Nested field "audit_user.email" from this node's output payload. |
| `audit_user.name` | string | Nested field "audit_user.name" from this node's output payload. |
| `audit_user.guest` | boolean | Nested field "audit_user.guest" from this node's output payload. |
| `audit_user.client` | string | Nested field "audit_user.client" from this node's output payload. |
| `audit_type` | string | What kind of item triggered the event — for example article, category, or user. |

## Related nodes

Other steps in the same area of the palette:

- **Extension After Install** (`event-onExtensionAfterInstall`) — Joomla Events › Extension Events
- **Extension After Uninstall** (`event-onExtensionAfterUninstall`) — Joomla Events › Extension Events
- **Extension After Update** (`event-onExtensionAfterUpdate`) — Joomla Events › Extension Events
- **Extension Before Install** (`event-onExtensionBeforeInstall`) — Joomla Events › Extension Events
- **Extension Before Update** (`event-onExtensionBeforeUpdate`) — Joomla Events › Extension Events