---
title: "Configuration inspector (readonly)"
manual: "TYPO3 Explained"
version: "13.4"
permalink: "https://docs.typo3.org/permalink/t3coreapi:config-module-blind-options@13.4"
source: "Configuration/Modules/SystemConfiguration/Index.rst"
rendered: "2026-09-17T15:24:38+00:00"
---

# Configuration inspector (readonly) {#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 integrators to view and validate the global configuration of TYPO3.
The module displays all relevant global variables, such as
[TYPO3_CONF_VARS](https://docs.typo3.org/permalink/t3coreapi:typo3confvars@13.4), [TCA](https://docs.typo3.org/m/typo3/reference-tca/13.4/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@13.4) and
[event listeners](https://docs.typo3.org/permalink/t3coreapi:eventdispatcherlisteners@13.4).

> [!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/13.4/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@13.4)
-   [Extending the Configuration module](https://docs.typo3.org/permalink/t3coreapi:extending-the-configuration-module@13.4)

> [!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` {#exploring-global-variables-in-array-globals}

Many of the global variables described in chapter [$GLOBALS](https://docs.typo3.org/permalink/t3coreapi:globals-variables@13.4)
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 {#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/13.4/en-us/BackendModules/Configuration.html#module-configuration).