Structure of a Theme for Drupal 8, 9, and 10

Each theme is a collection of files that define a presentation layer for Drupal. While only a file is required, most themes will contain other files as well. Some are Drupal-specific, and need to follow a strict naming convention and be placed in the appropriate place for Drupal to find them. Others are standard front-end web assets like CSS, JavaScript, and image files that can be placed anywhere within the theme's code.

In this tutorial we'll learn about:

  • The various types of files you can expect to find in a theme directory
  • Where in the Drupal code base your theme directory should live
  • Keeping the directory and all the files within organized

By the end of this tutorial you should be able to explain where a Drupal theme should be placed in a project's code base, and the types of files one can expect to find in a theme.

Theming Drupal Sites