What YAML is
An introduction to what YAML is and how to create and modify YAML files.
YAML structure
A description of the YAML file for Upsun.
YAML tags
A description of custom YAML tags available for Upsun files.
YAML
YAML
An overview of YAML and its use at Upsun.
YAML is a human-readable format for data serialization across languages.
This means it’s a good fit for human-edited configuration files, like those at Upsun.
You can control nearly all aspects of your project’s build and deploy pipeline with YAML files.
Learn what YAML is or, if you’re already familiar, what custom tags Upsun offers.
Last modified on March 12, 2026