---
title: "Howto guides for extension developers"
manual: "TYPO3 Explained"
version: "12.4"
permalink: "https://docs.typo3.org/permalink/t3coreapi:extension-howto@12.4"
source: "ExtensionArchitecture/HowTo/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).

# Howto guides for extension developers {#extension-howto}

Helps you kickstart your own extension or site package. Explains how
to publish an extension. Contains howto for different situations
like creating a frontend plugin, a backend module or to extend
existing TCA.

-   [Backend modules](https://docs.typo3.org/permalink/t3coreapi:backend-modules@12.4)
    -   [Modules.php](https://docs.typo3.org/permalink/t3coreapi:backend-module-configuration-examples@12.4)
    -   [Plain controller](https://docs.typo3.org/permalink/t3coreapi:create-a-backend-module-with-core-functionality@12.4)
    -   [Extbase controller](https://docs.typo3.org/permalink/t3coreapi:create-a-backend-module-with-extbase@12.4)
    -   [Security Considerations](https://docs.typo3.org/permalink/t3coreapi:security-considerations@12.4)
    -   [Tutorials](https://docs.typo3.org/permalink/t3coreapi:tutorial-backend-module-registration@12.4)
-   [Events](https://docs.typo3.org/permalink/t3coreapi:using-and-dispatching-events-in-extensions@12.4)
-   [Model extensions](https://docs.typo3.org/permalink/t3coreapi:extending-an-extbase-model@12.4)
-   [TCA extension](https://docs.typo3.org/permalink/t3coreapi:extending-the-tca-array@12.4)
    -   [Storing the changes](https://docs.typo3.org/permalink/t3coreapi:storing-the-changes@12.4)
    -   [Customization Examples](https://docs.typo3.org/permalink/t3coreapi:customization-examples@12.4)
    -   [Verifying the TCA](https://docs.typo3.org/permalink/t3coreapi:verifying-the-tca@12.4)
-   [Frontend plugin](https://docs.typo3.org/permalink/t3coreapi:frontend-plugin@12.4)
-   [Localization](https://docs.typo3.org/permalink/t3coreapi:localizing-your-extension@12.4)
    -   [Multi-language Fluid templates](https://docs.typo3.org/permalink/t3coreapi:multi-language-fluid-templates@12.4)
    -   [Localization in PHP](https://docs.typo3.org/permalink/t3coreapi:localization-in-php@12.4)
    -   [TypoScript](https://docs.typo3.org/permalink/t3coreapi:typoscript@12.4)
-   [Publishing](https://docs.typo3.org/permalink/t3coreapi:publish-your-extension@12.4)
    -   [Publish your extension in the TER](https://docs.typo3.org/permalink/t3coreapi:publish-your-extension-in-the-ter@12.4)
-   [External HTTP requests](https://docs.typo3.org/permalink/t3coreapi:http-requests-to-external-sources@12.4)
-   [Update](https://docs.typo3.org/permalink/t3coreapi:update-your-extension-for-new-typo3-versions@12.4)
    -   [Extension scanner](https://docs.typo3.org/permalink/t3coreapi:extension-scanner-1@12.4)
    -   [Upgrade wizards](https://docs.typo3.org/permalink/t3coreapi:upgrade-wizards-1@12.4)
        -   [Concept](https://docs.typo3.org/permalink/t3coreapi:the-concept-of-upgrade-wizards@12.4)
        -   [Implementation](https://docs.typo3.org/permalink/t3coreapi:implementing-an-upgrade-wizard@12.4)
-   [Configuration](https://docs.typo3.org/permalink/t3coreapi:configuration-methods-for-extensions@12.4)
-   [Distributions](https://docs.typo3.org/permalink/t3coreapi:creating-a-new-distribution@12.4)
-   [Extension repositories](https://docs.typo3.org/permalink/t3coreapi:custom-extension-repository-1@12.4)
-   [Documentation](https://docs.typo3.org/permalink/t3coreapi:adding-documentation@12.4)