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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href=https://json.nlohmann.me/integration/ rel=canonical><link rel=icon href=../assets/images/favicon.png><meta name=generator content="mkdocs-1.4.2, mkdocs-material-8.5.10"><title>Header only - JSON for Modern C++</title><link rel=stylesheet href=../assets/stylesheets/main.975780f9.min.css><link rel=stylesheet href=../assets/stylesheets/palette.2505c338.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../css/custom.css><script>__md_scope=new 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<label class=md-nav__title for=__nav_2_5> <span class="md-nav__icon md-icon"></span> Element Access </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../features/element_access/unchecked_access/ class=md-nav__link> Unchecked access: operator[] </a> </li> <li class=md-nav__item> <a href=../features/element_access/checked_access/ class=md-nav__link> Checked access: at </a> </li> <li class=md-nav__item> <a href=../features/element_access/default_value/ class=md-nav__link> Access with default value: value </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../features/iterators/ class=md-nav__link> Iterators </a> </li> <li class=md-nav__item> <a href=../features/json_pointer/ class=md-nav__link> JSON Pointer </a> </li> <li class=md-nav__item> <a href=../features/json_patch/ class=md-nav__link> JSON Patch and Diff </a> </li> <li class=md-nav__item> <a href=../features/merge_patch/ class=md-nav__link> JSON Merge Patch </a> </li> <li 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Package Managers </a> </li> <li class=md-nav__item> <a href=pkg-config/ class=md-nav__link> Pkg-config </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4 type=checkbox id=__nav_4> <label class=md-nav__link for=__nav_4> API Documentation <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav aria-label="API Documentation" data-md-level=1> <label class=md-nav__title for=__nav_4> <span class="md-nav__icon md-icon"></span> API Documentation </label> <ul class=md-nav__list data-md-scrollfix> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_1 type=checkbox id=__nav_4_1> <div class="md-nav__link md-nav__link--index "> <a href=../api/basic_json/ >basic_json</a> <label for=__nav_4_1> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=basic_json data-md-level=2> <label class=md-nav__title for=__nav_4_1> <span class="md-nav__icon md-icon"></span> basic_json </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../api/basic_json/basic_json/ class=md-nav__link> (Constructor) </a> </li> <li class=md-nav__item> <a href=../api/basic_json/~basic_json/ class=md-nav__link> (Destructor) </a> </li> <li class=md-nav__item> <a href=../api/basic_json/accept/ class=md-nav__link> accept </a> </li> <li class=md-nav__item> <a href=../api/basic_json/array/ class=md-nav__link> array </a> </li> <li class=md-nav__item> <a href=../api/basic_json/array_t/ class=md-nav__link> array_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/at/ class=md-nav__link> at </a> </li> <li class=md-nav__item> <a href=../api/basic_json/back/ class=md-nav__link> back </a> </li> <li class=md-nav__item> <a href=../api/basic_json/begin/ class=md-nav__link> begin </a> </li> <li class=md-nav__item> <a href=../api/basic_json/binary/ class=md-nav__link> binary </a> </li> <li class=md-nav__item> <a href=../api/basic_json/binary_t/ class=md-nav__link> binary_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/boolean_t/ class=md-nav__link> boolean_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/cbegin/ class=md-nav__link> cbegin </a> </li> <li class=md-nav__item> <a href=../api/basic_json/cbor_tag_handler_t/ class=md-nav__link> cbor_tag_handler_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/cend/ class=md-nav__link> cend </a> </li> <li class=md-nav__item> <a href=../api/basic_json/clear/ class=md-nav__link> clear </a> </li> <li class=md-nav__item> <a href=../api/basic_json/contains/ class=md-nav__link> contains </a> </li> <li class=md-nav__item> <a href=../api/basic_json/count/ class=md-nav__link> count </a> </li> <li class=md-nav__item> <a href=../api/basic_json/crbegin/ class=md-nav__link> crbegin </a> </li> <li class=md-nav__item> <a href=../api/basic_json/crend/ class=md-nav__link> crend </a> </li> <li class=md-nav__item> <a href=../api/basic_json/default_object_comparator_t/ class=md-nav__link> default_object_comparator_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/diff/ class=md-nav__link> diff </a> </li> <li class=md-nav__item> <a href=../api/basic_json/dump/ class=md-nav__link> dump </a> </li> <li class=md-nav__item> <a href=../api/basic_json/emplace/ class=md-nav__link> emplace </a> </li> <li class=md-nav__item> <a href=../api/basic_json/emplace_back/ class=md-nav__link> emplace_back </a> </li> <li class=md-nav__item> <a href=../api/basic_json/empty/ class=md-nav__link> empty </a> </li> <li class=md-nav__item> <a href=../api/basic_json/end/ class=md-nav__link> end </a> </li> <li class=md-nav__item> <a href=../api/basic_json/erase/ class=md-nav__link> erase </a> </li> <li class=md-nav__item> <a href=../api/basic_json/error_handler_t/ class=md-nav__link> error_handler_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/exception/ class=md-nav__link> exception </a> </li> <li class=md-nav__item> <a href=../api/basic_json/find/ class=md-nav__link> find </a> </li> <li class=md-nav__item> <a href=../api/basic_json/flatten/ class=md-nav__link> flatten </a> </li> <li class=md-nav__item> <a href=../api/basic_json/from_bjdata/ class=md-nav__link> from_bjdata </a> </li> <li class=md-nav__item> <a href=../api/basic_json/from_bson/ class=md-nav__link> from_bson </a> </li> <li class=md-nav__item> <a href=../api/basic_json/from_cbor/ class=md-nav__link> from_cbor </a> </li> <li class=md-nav__item> <a href=../api/basic_json/from_msgpack/ class=md-nav__link> from_msgpack </a> </li> <li class=md-nav__item> <a href=../api/basic_json/from_ubjson/ class=md-nav__link> from_ubjson </a> </li> <li class=md-nav__item> <a href=../api/basic_json/front/ class=md-nav__link> front </a> </li> <li class=md-nav__item> <a href=../api/basic_json/get/ class=md-nav__link> get </a> </li> <li class=md-nav__item> <a href=../api/basic_json/get_allocator/ class=md-nav__link> get_allocator </a> </li> <li class=md-nav__item> <a href=../api/basic_json/get_binary/ class=md-nav__link> get_binary </a> </li> <li class=md-nav__item> <a href=../api/basic_json/get_ptr/ class=md-nav__link> get_ptr </a> </li> <li class=md-nav__item> <a href=../api/basic_json/get_ref/ class=md-nav__link> get_ref </a> </li> <li class=md-nav__item> <a href=../api/basic_json/get_to/ class=md-nav__link> get_to </a> </li> <li class=md-nav__item> <a href=../api/basic_json/std_hash/ class=md-nav__link> std::hash&lt;basic_json&gt; </a> </li> <li class=md-nav__item> <a href=../api/basic_json/input_format_t/ class=md-nav__link> input_format_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/insert/ class=md-nav__link> insert </a> </li> <li class=md-nav__item> <a href=../api/basic_json/invalid_iterator/ class=md-nav__link> invalid_iterator </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_array/ class=md-nav__link> is_array </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_binary/ class=md-nav__link> is_binary </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_boolean/ class=md-nav__link> is_boolean </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_discarded/ class=md-nav__link> is_discarded </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_null/ class=md-nav__link> is_null </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_number/ class=md-nav__link> is_number </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_number_float/ class=md-nav__link> is_number_float </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_number_integer/ class=md-nav__link> is_number_integer </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_number_unsigned/ class=md-nav__link> is_number_unsigned </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_object/ class=md-nav__link> is_object </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_primitive/ class=md-nav__link> is_primitive </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_string/ class=md-nav__link> is_string </a> </li> <li class=md-nav__item> <a href=../api/basic_json/is_structured/ class=md-nav__link> is_structured </a> </li> <li class=md-nav__item> <a href=../api/basic_json/items/ class=md-nav__link> items </a> </li> <li class=md-nav__item> <a href=../api/basic_json/json_base_class_t/ class=md-nav__link> json_base_class_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/json_serializer/ class=md-nav__link> json_serializer </a> </li> <li class=md-nav__item> <a href=../api/basic_json/max_size/ class=md-nav__link> max_size </a> </li> <li class=md-nav__item> <a href=../api/basic_json/meta/ class=md-nav__link> meta </a> </li> <li class=md-nav__item> <a href=../api/basic_json/merge_patch/ class=md-nav__link> merge_patch </a> </li> <li class=md-nav__item> <a href=../api/basic_json/number_float_t/ class=md-nav__link> number_float_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/number_integer_t/ class=md-nav__link> number_integer_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/number_unsigned_t/ class=md-nav__link> number_unsigned_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/object/ class=md-nav__link> object </a> </li> <li class=md-nav__item> <a href=../api/basic_json/object_comparator_t/ class=md-nav__link> object_comparator_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/object_t/ class=md-nav__link> object_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_ValueType/ class=md-nav__link> operator ValueType </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_value_t/ class=md-nav__link> operator value_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator%5B%5D/ class=md-nav__link> operator[] </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator%3D/ class=md-nav__link> operator= </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator%2B%3D/ class=md-nav__link> operator+= </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_eq/ class=md-nav__link> operator== </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_ne/ class=md-nav__link> operator!= </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_lt/ class=md-nav__link> operator< </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_gt/ class=md-nav__link> operator> </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_le/ class=md-nav__link> operator<= </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_ge/ class=md-nav__link> operator>= </a> </li> <li class=md-nav__item> <a href=../api/basic_json/operator_spaceship/ class=md-nav__link> operator<=> </a> </li> <li class=md-nav__item> <a href=../api/basic_json/out_of_range/ class=md-nav__link> out_of_range </a> </li> <li class=md-nav__item> <a href=../api/basic_json/other_error/ class=md-nav__link> other_error </a> </li> <li class=md-nav__item> <a href=../api/basic_json/parse/ class=md-nav__link> parse </a> </li> <li class=md-nav__item> <a href=../api/basic_json/parse_error/ class=md-nav__link> parse_error </a> </li> <li class=md-nav__item> <a href=../api/basic_json/parse_event_t/ class=md-nav__link> parse_event_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/parser_callback_t/ class=md-nav__link> parser_callback_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/patch/ class=md-nav__link> patch </a> </li> <li class=md-nav__item> <a href=../api/basic_json/patch_inplace/ class=md-nav__link> patch_inplace </a> </li> <li class=md-nav__item> <a href=../api/basic_json/push_back/ class=md-nav__link> push_back </a> </li> <li class=md-nav__item> <a href=../api/basic_json/rbegin/ class=md-nav__link> rbegin </a> </li> <li class=md-nav__item> <a href=../api/basic_json/rend/ class=md-nav__link> rend </a> </li> <li class=md-nav__item> <a href=../api/basic_json/sax_parse/ class=md-nav__link> sax_parse </a> </li> <li class=md-nav__item> <a href=../api/basic_json/size/ class=md-nav__link> size </a> </li> <li class=md-nav__item> <a href=../api/basic_json/string_t/ class=md-nav__link> string_t </a> </li> <li class=md-nav__item> <a href=../api/basic_json/swap/ class=md-nav__link> swap </a> </li> <li class=md-nav__item> <a href=../api/basic_json/std_swap/ class=md-nav__link> std::swap&lt;basic_json&gt; </a> </li> <li class=md-nav__item> <a href=../api/basic_json/to_bjdata/ class=md-nav__link> to_bjdata </a> </li> <li class=md-nav__item> <a href=../api/basic_json/to_bson/ class=md-nav__link> to_bson </a> </li> <li class=md-nav__item> <a href=../api/basic_json/to_cbor/ class=md-nav__link> to_cbor </a> </li> <li class=md-nav__item> <a href=../api/basic_json/to_msgpack/ class=md-nav__link> to_msgpack </a> </li> <li class=md-nav__item> <a href=../api/basic_json/to_string/ class=md-nav__link> to_string </a> </li> <li class=md-nav__item> <a href=../api/basic_json/to_ubjson/ class=md-nav__link> to_ubjson </a> </li> <li class=md-nav__item> <a href=../api/basic_json/type/ class=md-nav__link> type </a> </li> <li class=md-nav__item> <a href=../api/basic_json/type_error/ class=md-nav__link> type_error </a> </li> <li class=md-nav__item> <a href=../api/basic_json/type_name/ class=md-nav__link> type_name </a> </li> <li class=md-nav__item> <a href=../api/basic_json/unflatten/ class=md-nav__link> unflatten </a> </li> <li class=md-nav__item> <a href=../api/basic_json/update/ class=md-nav__link> update </a> </li> <li class=md-nav__item> <a href=../api/basic_json/value/ class=md-nav__link> value </a> </li> <li class=md-nav__item> <a href=../api/basic_json/value_t/ class=md-nav__link> value_t </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_2 type=checkbox id=__nav_4_2> <div class="md-nav__link md-nav__link--index "> <a href=../api/byte_container_with_subtype/ >byte_container_with_subtype</a> <label for=__nav_4_2> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=byte_container_with_subtype data-md-level=2> <label class=md-nav__title for=__nav_4_2> <span class="md-nav__icon md-icon"></span> byte_container_with_subtype </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../api/byte_container_with_subtype/byte_container_with_subtype/ class=md-nav__link> (constructor) </a> </li> <li class=md-nav__item> <a href=../api/byte_container_with_subtype/clear_subtype/ class=md-nav__link> clear_subtype </a> </li> <li class=md-nav__item> <a href=../api/byte_container_with_subtype/has_subtype/ class=md-nav__link> has_subtype </a> </li> <li class=md-nav__item> <a href=../api/byte_container_with_subtype/set_subtype/ class=md-nav__link> set_subtype </a> </li> <li class=md-nav__item> <a href=../api/byte_container_with_subtype/subtype/ class=md-nav__link> subtype </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_3 type=checkbox id=__nav_4_3> <div class="md-nav__link md-nav__link--index "> <a href=../api/adl_serializer/ >adl_serializer</a> <label for=__nav_4_3> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=adl_serializer data-md-level=2> <label class=md-nav__title for=__nav_4_3> <span class="md-nav__icon md-icon"></span> adl_serializer </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../api/adl_serializer/from_json/ class=md-nav__link> from_json </a> </li> <li class=md-nav__item> <a href=../api/adl_serializer/to_json/ class=md-nav__link> to_json </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../api/json/ class=md-nav__link> json </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_5 type=checkbox id=__nav_4_5> <div class="md-nav__link md-nav__link--index "> <a href=../api/json_pointer/ >json_pointer</a> <label for=__nav_4_5> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=json_pointer data-md-level=2> <label class=md-nav__title for=__nav_4_5> <span class="md-nav__icon md-icon"></span> json_pointer </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../api/json_pointer/json_pointer/ class=md-nav__link> (Constructor) </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/back/ class=md-nav__link> back </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/empty/ class=md-nav__link> empty </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/operator_string_t/ class=md-nav__link> operator string_t </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/operator_eq/ class=md-nav__link> operator== </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/operator_ne/ class=md-nav__link> operator!= </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/operator_slash/ class=md-nav__link> operator/ </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/operator_slasheq/ class=md-nav__link> operator/= </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/parent_pointer/ class=md-nav__link> parent_pointer </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/pop_back/ class=md-nav__link> pop_back </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/push_back/ class=md-nav__link> push_back </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/string_t/ class=md-nav__link> string_t </a> </li> <li class=md-nav__item> <a href=../api/json_pointer/to_string/ class=md-nav__link> to_string </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_6 type=checkbox id=__nav_4_6> <div class="md-nav__link md-nav__link--index "> <a href=../api/json_sax/ >json_sax</a> <label for=__nav_4_6> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=json_sax data-md-level=2> <label class=md-nav__title for=__nav_4_6> <span class="md-nav__icon md-icon"></span> json_sax </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../api/json_sax/binary/ class=md-nav__link> binary </a> </li> <li class=md-nav__item> <a href=../api/json_sax/boolean/ class=md-nav__link> boolean </a> </li> <li class=md-nav__item> <a href=../api/json_sax/end_array/ class=md-nav__link> end_array </a> </li> <li class=md-nav__item> <a href=../api/json_sax/end_object/ class=md-nav__link> end_object </a> </li> <li class=md-nav__item> <a href=../api/json_sax/key/ class=md-nav__link> key </a> </li> <li class=md-nav__item> <a href=../api/json_sax/null/ class=md-nav__link> null </a> </li> <li class=md-nav__item> <a href=../api/json_sax/number_float/ class=md-nav__link> number_float </a> </li> <li class=md-nav__item> <a href=../api/json_sax/number_integer/ class=md-nav__link> number_integer </a> </li> <li class=md-nav__item> <a href=../api/json_sax/number_unsigned/ class=md-nav__link> number_unsigned </a> </li> <li class=md-nav__item> <a href=../api/json_sax/parse_error/ class=md-nav__link> parse_error </a> </li> <li class=md-nav__item> <a href=../api/json_sax/start_array/ class=md-nav__link> start_array </a> </li> <li class=md-nav__item> <a href=../api/json_sax/start_object/ class=md-nav__link> start_object </a> </li> <li class=md-nav__item> <a href=../api/json_sax/string/ class=md-nav__link> string </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../api/operator_ltlt/ class=md-nav__link> operator<<(basic_json) </a> </li> <li class=md-nav__item> <a href=../api/operator_ltlt/ class=md-nav__link> operator<<(json_pointer) </a> </li> <li class=md-nav__item> <a href=../api/operator_gtgt/ class=md-nav__link> operator>>(basic_json) </a> </li> <li class=md-nav__item> <a href=../api/operator_literal_json/ class=md-nav__link> operator""_json </a> </li> <li class=md-nav__item> <a href=../api/operator_literal_json_pointer/ class=md-nav__link> operator""_json_pointer </a> </li> <li class=md-nav__item> <a href=../api/ordered_json/ class=md-nav__link> ordered_json </a> </li> <li class=md-nav__item> <a href=../api/ordered_map/ class=md-nav__link> ordered_map </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=__nav_4_14 type=checkbox id=__nav_4_14> <div class="md-nav__link md-nav__link--index "> <a href=../api/macros/ >macros</a> <label for=__nav_4_14> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav aria-label=macros data-md-level=2> <label class=md-nav__title for=__nav_4_14> <span class="md-nav__icon md-icon"></span> macros </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../api/macros/json_assert/ class=md-nav__link> JSON_ASSERT </a> </li> <li class=md-nav__item> <a href=../api/macros/json_throw_user/ class=md-nav__link> JSON_CATCH_USER </a> </li> <li class=md-nav__item> <a href=../api/macros/json_diagnostics/ class=md-nav__link> JSON_DIAGNOSTICS </a> </li> <li class=md-nav__item> <a href=../api/macros/json_disable_enum_serialization/ class=md-nav__link> JSON_DISABLE_ENUM_SERIALIZATION </a> </li> <li class=md-nav__item> <a href=../api/macros/json_has_cpp_11/ class=md-nav__link> JSON_HAS_CPP_11 </a> </li> <li class=md-nav__item> <a href=../api/macros/json_has_cpp_11/ class=md-nav__link> JSON_HAS_CPP_14 </a> </li> <li class=md-nav__item> <a href=../api/macros/json_has_cpp_11/ class=md-nav__link> JSON_HAS_CPP_17 </a> </li> <li class=md-nav__item> <a href=../api/macros/json_has_cpp_11/ class=md-nav__link> JSON_HAS_CPP_20 </a> </li> <li class=md-nav__item> <a 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class=md-nav__link> NLOHMANN_JSON_VERSION_MAJOR </a> </li> <li class=md-nav__item> <a href=../api/macros/nlohmann_json_version_major/ class=md-nav__link> NLOHMANN_JSON_VERSION_MINOR </a> </li> <li class=md-nav__item> <a href=../api/macros/nlohmann_json_version_major/ class=md-nav__link> NLOHMANN_JSON_VERSION_PATCH </a> </li> </ul> </nav> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component=sidebar data-md-type=toc> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> </nav> </div> </div> </div> <div class=md-content data-md-component=content> <article class="md-content__inner md-typeset"> <a href=https://github.com/nlohmann/json/edit/develop/docs/mkdocs/docs/integration/index.md title="Edit this page" class="md-content__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25Z"/></svg> </a> <h1 id=header-only>Header only<a class=headerlink href=#header-only title="Permanent link">&para;</a></h1> <p><a href=https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp><code>json.hpp</code></a> is the single required file in <code>single_include/nlohmann</code> or <a href=https://github.com/nlohmann/json/releases>released here</a>. You need to add</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span><span class=cp></span>

<span class=c1>// for convenience</span>
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span><span class=w></span>
</code></pre></div> <p>to the files you want to process JSON and set the necessary switches to enable C++11 (e.g., <code>-std=c++11</code> for GCC and Clang).</p> <p>You can further use file <a href=https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json_fwd.hpp><code>single_include/nlohmann/json_fwd.hpp</code></a> for forward declarations.</p> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 8, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> </div> <a href=# class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../features/types/number_handling/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Number Handling" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> Number Handling </div> </div> </a> <a href=migration_guide/ class="md-footer__link md-footer__link--next" aria-label="Next: Migration Guide" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> Migration Guide </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright &copy; 2013 - 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