Datum json_build_array_worker(int nargs, Datum *args, bool *nulls, Oid *types, bool absent_on_null)
Datum json_build_object_worker(int nargs, Datum *args, bool *nulls, Oid *types, bool absent_on_null, bool unique_keys)
char * JsonEncodeDateTime(char *buf, Datum value, Oid typid, const int *tzp)
bool json_validate(text *json, bool check_unique_keys, bool throw_error)
void escape_json(StringInfo buf, const char *str)
bool to_json_is_immutable(Oid typoid)