Important: #93931 - Validation of Exensions’ composer.json files

See Issue #93931


Future TYPO3 versions will require extensions to have a valid composer.json file as a replacement for ext_emconf.php. This description file is used to define dependencies and the loading order of extensions within TYPO3.

In order to support site administrators by creating valid composer.json files for their extensions, the Extension manager now lists all affected extensions with details about the necessary adaptations. Site administrators can also use the new proposal functionality, which suggests a possible and valid composer.json file for those extensions by accessing (TER). is used to resolve dependencies to extensions, available in the TER.

You can also check your current installation for such extensions in the reports module.

Further information on the transition phase and examples of valid composer.json files for TYPO3 Extensions can be found on