---
title: "Create Custom Plugin"
slug: "create-custom-plugin-tag-integration"
updated: 2026-04-14T13:51:46Z
published: 2026-04-14T13:51:46Z
canonical: "docs.mapp.com/create-custom-plugin-tag-integration"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Custom Plugin

Create a Custom Plugin to extend your container with custom code.

---

## Prerequisites

- Access to Tag Integration
- A container where the plugin will be used
- The required code or external file reference for the plugin

---

## Procedure

1. Navigate to **Tag Integration**.
2. Open **Custom Plugins**.
3. Click **Create plugin**.
4. Enter a **Name** for the plugin.
5. (Optional) Enter one or more **Files** if the plugin requires external files.
6. Select a **Category** to group plugins for easier selection in the UI.
7. Select the **Position** where the plugin should be executed.
8. (Optional) Select a **Template** if a predefined template should be used.
9. Enter the plugin code in **Content**.
10. Select the **Language**.
11. (Optional) Enable **Use 'document.write'** if the plugin uses this method.
12. Click **Create**.

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## Result

The custom plugin is created and appears in the Custom Plugins Overview. You can then assign it to a container and use rules to control when it is executed.

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## Best Practices

- Use clear plugin names that describe the purpose of the plugin.
- Only enable `document.write` when the plugin requires it.
- Test custom plugins in a staging environment before using them in production.