ash_graphql/documentation/how_to/use-json-with-graphql.md

Use JSON with Graphql

AshGraphql provides two json types that may be used. They are the same except for how the type is serialized in responses.

• :json_string - serializes the json to a string, e.g "{\"foo\":1}"
• :json - leaves the json as an object, e.g {foo: 1}

By default, :json_string is used. The configuration for this is (uncharacteristically) placed in application config, for example:

config :ash_graphql, :json_type, :json