--- title: "YAML" manual: "TYPO3 Explained" version: "12.4" permalink: "https://docs.typo3.org/permalink/t3coreapi:yaml@12.4" source: "Configuration/Yaml/Index.rst" rendered: "2026-10-21T15:29:37+00:00" --- > [!WARNING] > **Attention** > > TYPO3 v12 has reached end-of-life as of April 30th 2026 and > is no longer being maintained. Use the version switcher on the top > left of this page to select documentation for a supported version of TYPO3. > > Need more time before upgrading? > You can purchase Extended Long Term Support (ELTS) for TYPO3 v12 here: > [TYPO3 ELTS](https://typo3.com/services/extended-support-elts). # YAML {#yaml} YAML is used in TYPO3 for various configurations; most notable are - [Event listeners](https://docs.typo3.org/permalink/t3coreapi:eventdispatcher@12.4) in [Configuration/Services.yaml](https://docs.typo3.org/permalink/t3coreapi:servicesyaml@12.4) - [Dependency injection](https://docs.typo3.org/permalink/t3coreapi:dependencyinjection@12.4) information in [Configuration/Services.yaml](https://docs.typo3.org/permalink/t3coreapi:servicesyaml@12.4) - [Site configuration](https://docs.typo3.org/permalink/t3coreapi:sitehandling@12.4) in `sites//config.yaml` - System extension [form](https://docs.typo3.org/c/typo3/cms-form/12.4/en-us/Index.html) configuration - System extension [rte_ckeditor](https://docs.typo3.org/c/typo3/cms-rte-ckeditor/12.4/en-us/Index.html) configuration - [YAML API](https://docs.typo3.org/permalink/t3coreapi:yaml-api-1@12.4) - [YAML syntax](https://docs.typo3.org/permalink/t3coreapi:yaml-syntax-1@12.4) - [Services.yaml](https://docs.typo3.org/permalink/t3coreapi:services-yaml@12.4)