It's supposed to be used in combination with doca - a tool that scaffolds API documentation based on JSON HyperSchemas.
npm install -g doca doca init -t node-docson
This creates a new API documentation with
doca-node-docson-theme as a dependency.
_schema property placed on an object or link schema will, if present, be passed to Node-Docson instead of the processed properties.
_targetSchema property placed on a link schema will, if present, be passed to Node-Docson to document the schema for the response of the link. If this property is not set, the response schema will not be passed to Node-Docson, since
targetSchema properties are not normally available to the theme.