http_json:reply

Formulate a JSON HTTP reply. See json_write/2 for details. The processed options are listed below. Remaining options are forwarded to json_write/3.

content_type(+Type): The default Content-type is application/json; charset=UTF8. charset=UTF8 should not be required because JSON is defined to be UTF-8 encoded, but some clients insist on it.
status(+Code): The default status is 200. REST API functions may use other values from the 2XX range, such as 201 (created).
json_object(+As): One of term (classical json representation) or dict to use the new dict representation. If omitted and Term is a dict, dict is assumed. SWI-Prolog Version 7.