JSON Parsing (Draft) - simplepie/simplepie-ng GitHub Wiki
JSON (RFC 7159) is the intended serialization of the JSON Feed format. As such, SimplePie NG has been designed from the beginning with support for multiple feed serialization types.
High-Level Internals
Internally, we use json_decode() to parse the JSON data into an object. The internal JSON parser has been the very-fast jsond since PHP 7.0.
TBD.