---
title: "Configuration inspector (readonly)"
manual: "TYPO3 Explained"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3coreapi:config-module-blind-options@main"
source: "Configuration/Modules/SystemConfiguration/Index.rst"
modified: "2026-09-15T12:49:12+00:00"
---

# Configuration inspector (readonly)

Only available if [`typo3/cms-lowlevel`](https://packagist.org/packages/typo3/cms-lowlevel) is installed.

The configuration module can be found at **System > Configuration**.
It allows users with system maintainer permissions to view and validate the
global configuration of TYPO3.

> [!NOTE]
> **Changed in version 14.0**
>
> The **System > Configuration** module is now only available
> for system maintainers.

The module displays all relevant global variables, such as
[TYPO3_CONF_VARS](https://docs.typo3.org/permalink/t3coreapi:typo3confvars@main), [TCA](https://docs.typo3.org/m/typo3/reference-tca/main/en-us/Index.html#start) and many more,
in a tree format which is easy to browse through. Over time, this module has been
extended to also display configuration of newly introduced features like the
[middleware stack](https://docs.typo3.org/permalink/t3coreapi:request-handling@main) and
[event listeners](https://docs.typo3.org/permalink/t3coreapi:eventdispatcherlisteners@main).

> [!NOTE]
> **See also**
>
> The module is described in detail in the
> [EXT:lowlevel docs, chapter Module System > Configuration](https://docs.typo3.org/c/typo3/cms-lowlevel/main/en-us/BackendModules/Configuration.html#module-configuration)

**Table of Contents**

-   [Exploring global variables in array $GLOBALS](https://docs.typo3.org/permalink/t3coreapi:exploring-global-variables-in-array-globals@main)
-   [Extending the configuration module](https://docs.typo3.org/permalink/t3coreapi:extending-the-configuration-module@main)

> [!WARNING]
> This module is always viewed in the backend context. Variables defined
> only in the FE context will not be visible.

## Exploring global variables in array `$GLOBALS`

Many of the global variables described in chapter [$GLOBALS](https://docs.typo3.org/permalink/t3coreapi:globals-variables@main)
can be inspected using the module **System > Configuration**.

![Backend module System -> Configuration with the selector open to demonstrate $GLOBALS variables that can be displayed](../../../Images/ManualScreenshots/Backend/SystemConfigurationGlobals.png)

## Extending the configuration module

The **System > Configuration** module can also be extended or configured
to blind options. See the [`typo3/cms-lowlevel`](https://packagist.org/packages/typo3/cms-lowlevel) manual, chapter
[Configuration module](https://docs.typo3.org/c/typo3/cms-lowlevel/main/en-us/BackendModules/Configuration.html#module-configuration).