---
title: "Breaking: #88564 - PageTSconfig setting \"TSFE.constants\" removed"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-88564"
source: "Changelog/10.0/Breaking-88564-PageTSconfigSettingTSFEconstantsRemoved.rst"
modified: "2026-09-14T09:47:36+00:00"
---

# Breaking: #88564 - PageTSconfig setting "TSFE.constants" removed

See [forge#88564](https://forge.typo3.org/issues/88564)

## Description

The PageTSconfig / UserTSconfig `TSFE.constants`, which allowed to override settings constants
on a per-tree level page was introduced in TYPO3 at the very beginning, long before TSconfig had conditions.

It was used to share TypoScript-based configuration between frontend / backend, and on a per-page/tree level.

However, this has been superseded for a long time by using proper configuration files which
can be loaded at any time, for example when `ext_localconf.php` of an extension is loaded.

Therefore, the option has been removed.

## Impact

Setting `TSFE.constants` in PageTSconfig or UserTSconfig has no effect, as it is not evaluated
anymore.

## Affected Installations

Any TYPO3 installation using `TSFE.constants` in their PageTSconfig.

## Migration

It is recommended to include TypoScript conditions in setup/constants, also since constants+setup
are evaluated in Backend context for Extbase modules. This option is not needed anymore and
can be substituted by simple constants in `sys_template` or any Extension inclusion files as well.