Extension Key missing in composer.json

[CarstenHager]

Text from the Extension Modul in TYPO3

Invalid composer.json files in extensions

Future TYPO3 versions will require all extensions in your TYPO3 installation to contain a composer.json file in their extension directory. This is needed to properly detect the composer-based package name, the relevant extension key and the dependencies to other packages / extensions. Below is a list of extensions in your TYPO3 installation, which currently do not meet those requirements and therefore need adaptations to their composer.json file.

For third-party extensions that were fetched from TER, it is helpful to update to their latest version from TER which probably already contains a valid composer.json file.