Creating a new extension

First choose a unique Composer name for your extension. Additionally, an extension key is required.

If you plan to ever publish your extension in the TYPO3 Extension Repository (TER), register an extension key.

Kickstarting the extension

There are different options to kickstart an extension. You can create it from scratch or follow one of our tutorials on kickstarting an extension.

Installing the newly created extension

Starting with TYPO3 v11 it is no longer possible to install extensions in TYPO3 without using Composer in Composer-based installations.

However during development it is necessary to test your extension locally before publishing it. Place the extension directory into the directory called, packages inside of the TYPO3 project root directory.

Then edit your projects composer.json (The one in the TYPO3 root directory, not the one in the extension) and add the following repository:

composer.json 
{
   "repositories": [
      {
         "type": "path",
         "url": "packages/*"
      }
   ]
}
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After that you can install your extension via Composer:

composer req my-vendor/my-extension:"@dev"
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