Glossary: TCA

TCA

The Table Configuration Array (TCA) defines database tables and their backend form rendering in TYPO3. It controls fields, labels, render types, validation, relations, and how records appear and behave in the backend.

Use Cases for TCA

TCA is typically used to model data structures and editor forms, such as:

• Defining custom tables and fields for extensions
• Extending existing core tables (e.g. tt_content) with additional columns
• Configuring field render types, validations, and select options
• Setting up inline relations (IRRE) and many-to-many references

How TCA Works

• TCA is declared in PHP files under Configuration/TCA/ and loaded during TYPO3 bootstrap.
• The backend form engine reads TCA to render forms, labels, palettes, and tabs.
• Overrides in Configuration/TCA/Overrides/ adapt core or third-party configurations without patching their files.

Advantages

• Single source of truth for data structure and backend UI
• Powerful form rendering with validations and custo