Coding Guidelines

This chapter contains description of the formal requirements or standards regarding coding that you should adhere to when you develop TYPO3 extensions or Core parts.


You can find an .editorconfig file in the TYPO3 Core repository. Some editors and IDEs can use this file and the rules defined within.

Some basic rules are defined in the .editorconfig, such as the charset and the indenting style. By default, indenting with 4 spaces is used, but there are a few exceptions (e.g. for YAML or JSON files).

For the files that are not specifically covered in the subchapters (e.g. Fluid, .json, or .sql), the information in the .editorconfig file should be sufficient.