Project: json

Language c++
OSS-Fuzz project link
Project repository link
Build status: Fuzzers succeeding: Build log
Build status: Code coverage succeeding: Build log
Build status: Fuzz Introspector succeeding: Build log
Fuzzer count 6
Lines of code 8310
Lines covered 6193
Code coverage 74.52%
Code coverage report Report link
Static reachability 97.12%
Fuzz Introspector report Report link (from 2025-03-17)
Fuzzer Code coverage (lines) Latest Report Comments
parse_afl_fuzzer 57.9% (avg: 57.9%, max: 57.9%) 2025-03-17
parse_bjdata_fuzzer 42.36% (avg: 42.36%, max: 42.36%) 2025-03-17
parse_bson_fuzzer 14.85% (avg: 14.85%, max: 14.85%) 2025-03-17
parse_cbor_fuzzer 22.16% (avg: 22.16%, max: 22.16%) 2025-03-17
parse_msgpack_fuzzer 21.72% (avg: 21.72%, max: 21.72%) 2025-03-17
parse_ubjson_fuzzer 33.14% (avg: 33.24%, max: 33.6%) 2025-03-17

Historical Progression

Per Fuzzer Progression

Functions of interest to fuzz

This section outlines functions that may be of interest to fuzz. They are based on ranking functions that have a lot of complexity but currently exhibit low code coverage. The complexity is calculated based on the function itself as well as the functions called by the given function, i.e. the tree of code that the function triggers.


This is only a minor amount of introspection information available for this project. Please consult the Fuzz Introspector report for more information, e.g. the introspection table of all functions in the target project available here.

Function name Function source file Accumulated cyclomatic complexity Code coverage
std::__1::pair<bool,nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>*>nlohmann::json_abi_v3_11_3::detail::json_sax_dom_callback_parser<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>,nlohmann::json_abi_v3_11_3::detail::iterator_input_adapter<std::__1::__wrap_iter<charconst*>>>::handle_value<decltype(nullptr)>(decltype(nullptr)&&,bool) /src/json/tests/../single_include/nlohmann/json.hpp 295 0.0%
std::__1::pair<bool,nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>*>nlohmann::json_abi_v3_11_3::detail::json_sax_dom_callback_parser<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>,nlohmann::json_abi_v3_11_3::detail::iterator_input_adapter<unsignedcharconst*>>::handle_value<decltype(nullptr)>(decltype(nullptr)&&,bool) /src/json/tests/../single_include/nlohmann/json.hpp 294 0.0%
std::__1::pair<bool,nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>*>nlohmann::json_abi_v3_11_3::detail::json_sax_dom_callback_parser<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>,nlohmann::json_abi_v3_11_3::detail::iterator_input_adapter<std::__1::__wrap_iter<charconst*>>>::handle_value<nlohmann::json_abi_v3_11_3::detail::value_t>(nlohmann::json_abi_v3_11_3::detail::value_t&&,bool) /src/json/tests/../single_include/nlohmann/json.hpp 290 0.0%
std::__1::pair<bool,nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>*>nlohmann::json_abi_v3_11_3::detail::json_sax_dom_callback_parser<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>,nlohmann::json_abi_v3_11_3::detail::iterator_input_adapter<unsignedcharconst*>>::handle_value<nlohmann::json_abi_v3_11_3::detail::value_t>(nlohmann::json_abi_v3_11_3::detail::value_t&&,bool) /src/json/tests/../single_include/nlohmann/json.hpp 289 0.0%
_ZN8nlohmann16json_abi_v3_11_310basic_jsonINSt3__13mapENS2_6vectorENS2_12basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEEblmdS8_NS0_14adl_serializerENS4_IhNS8_IhEEEEvE5eraseINS0_6detail9iter_implISE_EETnNS2_9enable_ifIXoosr3std7is_sameIT_SI_EE5valuesr3std7is_sameISK_NSH_IKSE_EEEE5valueEiE4typeELi0EEESK_SK_ /src/json/tests/../single_include/nlohmann/json.hpp 260 0.0%
nlohmann::json_abi_v3_11_3::detail::iter_impl<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>>::operator->()const /src/json/tests/../single_include/nlohmann/json.hpp 142 0.0%
std::__1::pair<bool,nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>*>nlohmann::json_abi_v3_11_3::detail::json_sax_dom_callback_parser<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>,nlohmann::json_abi_v3_11_3::detail::iterator_input_adapter<std::__1::__wrap_iter<charconst*>>>::handle_value<unsignedlong&>(unsignedlong&,bool) /src/json/tests/../single_include/nlohmann/json.hpp 140 0.0%
std::__1::pair<bool,nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>*>nlohmann::json_abi_v3_11_3::detail::json_sax_dom_callback_parser<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>,nlohmann::json_abi_v3_11_3::detail::iterator_input_adapter<std::__1::__wrap_iter<charconst*>>>::handle_value<long&>(long&,bool) /src/json/tests/../single_include/nlohmann/json.hpp 140 0.0%
std::__1::pair<bool,nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>*>nlohmann::json_abi_v3_11_3::detail::json_sax_dom_callback_parser<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>,nlohmann::json_abi_v3_11_3::detail::iterator_input_adapter<std::__1::__wrap_iter<charconst*>>>::handle_value<bool&>(bool&,bool) /src/json/tests/../single_include/nlohmann/json.hpp 140 0.0%
std::__1::pair<bool,nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>*>nlohmann::json_abi_v3_11_3::detail::json_sax_dom_callback_parser<nlohmann::json_abi_v3_11_3::basic_json<std::__1::map,std::__1::vector,std::__1::basic_string<char,std::__1::char_traits<char>,std::__1::allocator<char>>,bool,long,unsignedlong,double,std::__1::allocator,nlohmann::json_abi_v3_11_3::adl_serializer,std::__1::vector<unsignedchar,std::__1::allocator<unsignedchar>>,void>,nlohmann::json_abi_v3_11_3::detail::iterator_input_adapter<std::__1::__wrap_iter<charconst*>>>::handle_value<double&>(double&,bool) /src/json/tests/../single_include/nlohmann/json.hpp 140 0.0%