In swagger's documentation using OpenApi specification, you can wrap schema in parameter to content with application/json:
parameters:
- in: query
name: filter
# Wrap 'schema' into 'content.<media-type>'
content:
application/json: # <---- media type indicates how to serialize / deserialize the parameter content
schema:
type: object
properties:
type:
type: string
color:
type: string
to send objects like this filter={"type":"t-shirt","color":"blue"}
.
How to do it in swagger-php?