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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/features/parsing/untrusted_input/" rel="canonical"><link href=../sax_interface/ rel=prev><link href=../../assertions/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Parsing Untrusted Input - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><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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href=../../binary_values/ class=md-nav__link> <span class=md-ellipsis> Binary Values </span> </a> </li> <li class=md-nav__item> <a href=../../comments/ class=md-nav__link> <span class=md-ellipsis> Comments </span> </a> </li> <li class=md-nav__item> <a href=../../conversions/ class=md-nav__link> <span class=md-ellipsis> Converting values </span> </a> </li> <li class=md-nav__item> <a href=../../creating_values/ class=md-nav__link> <span class=md-ellipsis> Creating JSON values </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_2_8> <div class="md-nav__link md-nav__container"> <a href=../../element_access/ class="md-nav__link "> <span class=md-ellipsis> Element Access </span> </a> <label class="md-nav__link " for=__nav_2_8 id=__nav_2_8_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_2_8_label aria-expanded=false> <label 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Patch and Diff </span> </a> </li> <li class=md-nav__item> <a href=../../json_pointer/ class=md-nav__link> <span class=md-ellipsis> JSON Pointer </span> </a> </li> <li class=md-nav__item> <a href=../../modifying_values/ class=md-nav__link> <span class=md-ellipsis> Modifying values </span> </a> </li> <li class=md-nav__item> <a href=../../modules/ class=md-nav__link> <span class=md-ellipsis> Modules </span> </a> </li> <li class=md-nav__item> <a href=../../namespace/ class=md-nav__link> <span class=md-ellipsis> nlohmann Namespace </span> </a> </li> <li class=md-nav__item> <a href=../../object_order/ class=md-nav__link> <span class=md-ellipsis> Object Order </span> </a> </li> <li class=md-nav__item> <a href=../../performance/ class=md-nav__link> <span class=md-ellipsis> Performance </span> </a> </li> <li class="md-nav__item md-nav__item--active md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_2_18 checked> <div class="md-nav__link md-nav__container"> <a href=../ class="md-nav__link "> <span class=md-ellipsis> Parsing </span> </a> <label class="md-nav__link " for=__nav_2_18 id=__nav_2_18_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_2_18_label aria-expanded=true> <label class=md-nav__title for=__nav_2_18> <span class="md-nav__icon md-icon"></span> Parsing </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../json_lines/ class=md-nav__link> <span class=md-ellipsis> JSON Lines </span> </a> </li> <li class=md-nav__item> <a href=../parse_exceptions/ class=md-nav__link> <span class=md-ellipsis> Parsing and Exceptions </span> </a> </li> <li class=md-nav__item> <a href=../parser_callbacks/ class=md-nav__link> <span class=md-ellipsis> Parser Callbacks </span> </a> </li> <li class=md-nav__item> <a href=../sax_interface/ class=md-nav__link> <span class=md-ellipsis> SAX Interface </span> </a> </li> <li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" type=checkbox id=__toc> <label class="md-nav__link md-nav__link--active" for=__toc> <span class=md-ellipsis> Parsing Untrusted Input </span> <span class="md-nav__icon md-icon"></span> </label> <a href=./ class="md-nav__link md-nav__link--active"> <span class=md-ellipsis> Parsing Untrusted Input </span> </a> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#errors-without-exceptions class=md-nav__link> <span class=md-ellipsis> Errors without exceptions </span> </a> </li> <li class=md-nav__item> <a href=#nesting-depth class=md-nav__link> <span class=md-ellipsis> Nesting depth </span> </a> </li> <li class=md-nav__item> <a href=#input-size class=md-nav__link> <span class=md-ellipsis> Input size </span> </a> </li> <li class=md-nav__item> <a href=#strings class=md-nav__link> <span class=md-ellipsis> Strings </span> </a> </li> <li class=md-nav__item> <a href=#duplicate-object-keys class=md-nav__link> <span class=md-ellipsis> Duplicate object keys </span> </a> </li> <li class=md-nav__item> <a href=#numbers class=md-nav__link> <span class=md-ellipsis> Numbers </span> </a> </li> <li class=md-nav__item> <a href=#comments-and-trailing-commas class=md-nav__link> <span class=md-ellipsis> Comments and trailing commas </span> </a> </li> <li class=md-nav__item> <a href=#checklist class=md-nav__link> <span class=md-ellipsis> Checklist </span> </a> </li> <li class=md-nav__item> <a href=#see-also class=md-nav__link> <span class=md-ellipsis> See also </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../assertions/ class=md-nav__link> <span class=md-ellipsis> Runtime Assertions </span> </a> </li> <li class=md-nav__item> <a href=../../serialization/ class=md-nav__link> <span class=md-ellipsis> Serialization </span> </a> </li> <li class=md-nav__item> <a href=../../enum_conversion/ class=md-nav__link> <span class=md-ellipsis> Specializing enum conversion </span> </a> </li> <li class=md-nav__item> <a href=../../macros/ class=md-nav__link> <span class=md-ellipsis> Supported Macros </span> </a> </li> <li class=md-nav__item> <a href=../../trailing_commas/ class=md-nav__link> <span class=md-ellipsis> Trailing Commas </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_2_24> <div class="md-nav__link md-nav__container"> <a href=../../types/ class="md-nav__link "> <span class=md-ellipsis> Types </span> </a> <label class="md-nav__link " for=__nav_2_24 id=__nav_2_24_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_2_24_label aria-expanded=false> <label class=md-nav__title for=__nav_2_24> <span class="md-nav__icon md-icon"></span> Types </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../types/number_handling/ class=md-nav__link> <span class=md-ellipsis> Number Handling </span> </a> </li> <li class=md-nav__item> <a href=../../types/template_parameters/ class=md-nav__link> <span class=md-ellipsis> Template Parameter Requirements </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_3> <div class="md-nav__link md-nav__container"> <a href=../../../integration/ class="md-nav__link "> <span class=md-ellipsis> Integration </span> </a> <label class="md-nav__link " for=__nav_3 id=__nav_3_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_3_label aria-expanded=false> <label class=md-nav__title for=__nav_3> <span class="md-nav__icon md-icon"></span> Integration </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../integration/migration_guide/ class=md-nav__link> <span class=md-ellipsis> Migration Guide </span> </a> </li> <li class=md-nav__item> <a href=../../../integration/cmake/ class=md-nav__link> <span class=md-ellipsis> CMake </span> </a> </li> <li class=md-nav__item> <a href=../../../integration/package_managers/ class=md-nav__link> <span class=md-ellipsis> Package Managers </span> </a> </li> <li class=md-nav__item> <a href=../../../integration/pkg-config/ class=md-nav__link> <span class=md-ellipsis> Pkg-config </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4> <label class=md-nav__link for=__nav_4 id=__nav_4_label tabindex=0> <span class=md-ellipsis> API Documentation </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_4_label aria-expanded=false> <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 " type=checkbox id=__nav_4_1> <div class="md-nav__link md-nav__container"> <a href=../../../api/basic_json/ class="md-nav__link "> <span class=md-ellipsis> basic_json </span> </a> <label class="md-nav__link " for=__nav_4_1 id=__nav_4_1_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_1_label aria-expanded=false> <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> <span class=md-ellipsis> (Constructor) </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/~basic_json/ class=md-nav__link> <span class=md-ellipsis> (Destructor) </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/accept/ class=md-nav__link> <span class=md-ellipsis> accept </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/array/ class=md-nav__link> <span class=md-ellipsis> array </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/array_t/ class=md-nav__link> <span class=md-ellipsis> array_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/at/ class=md-nav__link> <span class=md-ellipsis> at </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/back/ class=md-nav__link> <span class=md-ellipsis> back </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/begin/ class=md-nav__link> <span class=md-ellipsis> begin </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/binary/ class=md-nav__link> <span class=md-ellipsis> binary </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/binary_t/ class=md-nav__link> <span class=md-ellipsis> binary_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/boolean_t/ class=md-nav__link> <span class=md-ellipsis> boolean_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/cbegin/ class=md-nav__link> <span class=md-ellipsis> cbegin </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/cbor_tag_handler_t/ class=md-nav__link> <span class=md-ellipsis> cbor_tag_handler_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/cend/ class=md-nav__link> <span class=md-ellipsis> cend </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/clear/ class=md-nav__link> <span class=md-ellipsis> clear </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/contains/ class=md-nav__link> <span class=md-ellipsis> contains </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/count/ class=md-nav__link> <span class=md-ellipsis> count </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/crbegin/ class=md-nav__link> <span class=md-ellipsis> crbegin </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/crend/ class=md-nav__link> <span class=md-ellipsis> crend </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/default_object_comparator_t/ class=md-nav__link> <span class=md-ellipsis> default_object_comparator_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/diff/ class=md-nav__link> <span class=md-ellipsis> diff </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/dump/ class=md-nav__link> <span class=md-ellipsis> dump </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/emplace/ class=md-nav__link> <span class=md-ellipsis> emplace </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/emplace_back/ class=md-nav__link> <span class=md-ellipsis> emplace_back </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/empty/ class=md-nav__link> <span class=md-ellipsis> empty </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/end/ class=md-nav__link> <span class=md-ellipsis> end </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/end_pos/ class=md-nav__link> <span class=md-ellipsis> end_pos </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/erase/ class=md-nav__link> <span class=md-ellipsis> erase </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/error_handler_t/ class=md-nav__link> <span class=md-ellipsis> error_handler_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/exception/ class=md-nav__link> <span class=md-ellipsis> exception </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/find/ class=md-nav__link> <span class=md-ellipsis> find </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/flatten/ class=md-nav__link> <span class=md-ellipsis> flatten </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/format_as/ class=md-nav__link> <span class=md-ellipsis> format_as </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/from_bjdata/ class=md-nav__link> <span class=md-ellipsis> from_bjdata </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/from_bon8/ class=md-nav__link> <span class=md-ellipsis> from_bon8 </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/from_bson/ class=md-nav__link> <span class=md-ellipsis> from_bson </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/from_cbor/ class=md-nav__link> <span class=md-ellipsis> from_cbor </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/from_msgpack/ class=md-nav__link> <span class=md-ellipsis> from_msgpack </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/from_ubjson/ class=md-nav__link> <span class=md-ellipsis> from_ubjson </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/front/ class=md-nav__link> <span class=md-ellipsis> front </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/get/ class=md-nav__link> <span class=md-ellipsis> get </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/get_allocator/ class=md-nav__link> <span class=md-ellipsis> get_allocator </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/get_binary/ class=md-nav__link> <span class=md-ellipsis> get_binary </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/get_ptr/ class=md-nav__link> <span class=md-ellipsis> get_ptr </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/get_ref/ class=md-nav__link> <span class=md-ellipsis> get_ref </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/get_to/ class=md-nav__link> <span class=md-ellipsis> get_to </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/std_formatter/ class=md-nav__link> <span class=md-ellipsis> std::formatter<basic_json> </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/std_hash/ class=md-nav__link> <span class=md-ellipsis> std::hash<basic_json> </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/input_format_t/ class=md-nav__link> <span class=md-ellipsis> input_format_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/insert/ class=md-nav__link> <span class=md-ellipsis> insert </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/invalid_iterator/ class=md-nav__link> <span class=md-ellipsis> invalid_iterator </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_array/ class=md-nav__link> <span class=md-ellipsis> is_array </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_binary/ class=md-nav__link> <span class=md-ellipsis> is_binary </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_boolean/ class=md-nav__link> <span class=md-ellipsis> is_boolean </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_discarded/ class=md-nav__link> <span class=md-ellipsis> is_discarded </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_null/ class=md-nav__link> <span class=md-ellipsis> is_null </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_number/ class=md-nav__link> <span class=md-ellipsis> is_number </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_number_float/ class=md-nav__link> <span class=md-ellipsis> is_number_float </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_number_integer/ class=md-nav__link> <span class=md-ellipsis> is_number_integer </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_number_unsigned/ class=md-nav__link> <span class=md-ellipsis> is_number_unsigned </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_object/ class=md-nav__link> <span class=md-ellipsis> is_object </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_primitive/ class=md-nav__link> <span class=md-ellipsis> is_primitive </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_string/ class=md-nav__link> <span class=md-ellipsis> is_string </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/is_structured/ class=md-nav__link> <span class=md-ellipsis> is_structured </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/items/ class=md-nav__link> <span class=md-ellipsis> items </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/json_base_class_t/ class=md-nav__link> <span class=md-ellipsis> json_base_class_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/json_serializer/ class=md-nav__link> <span class=md-ellipsis> json_serializer </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/max_size/ class=md-nav__link> <span class=md-ellipsis> max_size </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/meta/ class=md-nav__link> <span class=md-ellipsis> meta </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/merge_patch/ class=md-nav__link> <span class=md-ellipsis> merge_patch </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/number_float_t/ class=md-nav__link> <span class=md-ellipsis> number_float_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/number_integer_t/ class=md-nav__link> <span class=md-ellipsis> number_integer_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/number_unsigned_t/ class=md-nav__link> <span class=md-ellipsis> number_unsigned_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/object/ class=md-nav__link> <span class=md-ellipsis> object </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/object_comparator_t/ class=md-nav__link> <span class=md-ellipsis> object_comparator_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/object_t/ class=md-nav__link> <span class=md-ellipsis> object_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_ValueType/ class=md-nav__link> <span class=md-ellipsis> operator ValueType </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_value_t/ class=md-nav__link> <span class=md-ellipsis> operator value_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator%5B%5D/ class=md-nav__link> <span class=md-ellipsis> operator[] </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator%3D/ class=md-nav__link> <span class=md-ellipsis> operator= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator%2B%3D/ class=md-nav__link> <span class=md-ellipsis> operator+= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_eq/ class=md-nav__link> <span class=md-ellipsis> operator== </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_ne/ class=md-nav__link> <span class=md-ellipsis> operator!= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_lt/ class=md-nav__link> <span class=md-ellipsis> operator< </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_gt/ class=md-nav__link> <span class=md-ellipsis> operator> </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_le/ class=md-nav__link> <span class=md-ellipsis> operator<= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_ge/ class=md-nav__link> <span class=md-ellipsis> operator>= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/operator_spaceship/ class=md-nav__link> <span class=md-ellipsis> operator<=> </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/out_of_range/ class=md-nav__link> <span class=md-ellipsis> out_of_range </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/other_error/ class=md-nav__link> <span class=md-ellipsis> other_error </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/parse/ class=md-nav__link> <span class=md-ellipsis> parse </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/parse_error/ class=md-nav__link> <span class=md-ellipsis> parse_error </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/parse_event_t/ class=md-nav__link> <span class=md-ellipsis> parse_event_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/parser_callback_t/ class=md-nav__link> <span class=md-ellipsis> parser_callback_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/patch/ class=md-nav__link> <span class=md-ellipsis> patch </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/patch_inplace/ class=md-nav__link> <span class=md-ellipsis> patch_inplace </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/push_back/ class=md-nav__link> <span class=md-ellipsis> push_back </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/rbegin/ class=md-nav__link> <span class=md-ellipsis> rbegin </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/rend/ class=md-nav__link> <span class=md-ellipsis> rend </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/sax_parse/ class=md-nav__link> <span class=md-ellipsis> sax_parse </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/size/ class=md-nav__link> <span class=md-ellipsis> size </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/start_pos/ class=md-nav__link> <span class=md-ellipsis> start_pos </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/string_t/ class=md-nav__link> <span class=md-ellipsis> string_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/swap/ class=md-nav__link> <span class=md-ellipsis> swap </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/std_swap/ class=md-nav__link> <span class=md-ellipsis> std::swap<basic_json> </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/to_bjdata/ class=md-nav__link> <span class=md-ellipsis> to_bjdata </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/to_bon8/ class=md-nav__link> <span class=md-ellipsis> to_bon8 </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/to_bson/ class=md-nav__link> <span class=md-ellipsis> to_bson </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/to_cbor/ class=md-nav__link> <span class=md-ellipsis> to_cbor </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/to_msgpack/ class=md-nav__link> <span class=md-ellipsis> to_msgpack </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/to_string/ class=md-nav__link> <span class=md-ellipsis> to_string </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/to_ubjson/ class=md-nav__link> <span class=md-ellipsis> to_ubjson </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/type/ class=md-nav__link> <span class=md-ellipsis> type </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/type_error/ class=md-nav__link> <span class=md-ellipsis> type_error </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/type_name/ class=md-nav__link> <span class=md-ellipsis> type_name </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/unflatten/ class=md-nav__link> <span class=md-ellipsis> unflatten </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/update/ class=md-nav__link> <span class=md-ellipsis> update </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/value/ class=md-nav__link> <span class=md-ellipsis> value </span> </a> </li> <li class=md-nav__item> <a href=../../../api/basic_json/value_t/ class=md-nav__link> <span class=md-ellipsis> value_t </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_2> <div class="md-nav__link md-nav__container"> <a href=../../../api/byte_container_with_subtype/ class="md-nav__link "> <span class=md-ellipsis> byte_container_with_subtype </span> </a> <label class="md-nav__link " for=__nav_4_2 id=__nav_4_2_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_2_label aria-expanded=false> <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> <span class=md-ellipsis> (constructor) </span> </a> </li> <li class=md-nav__item> <a href=../../../api/byte_container_with_subtype/clear_subtype/ class=md-nav__link> <span class=md-ellipsis> clear_subtype </span> </a> </li> <li class=md-nav__item> <a href=../../../api/byte_container_with_subtype/has_subtype/ class=md-nav__link> <span class=md-ellipsis> has_subtype </span> </a> </li> <li class=md-nav__item> <a href=../../../api/byte_container_with_subtype/operator_eq/ class=md-nav__link> <span class=md-ellipsis> operator== </span> </a> </li> <li class=md-nav__item> <a href=../../../api/byte_container_with_subtype/operator_ne/ class=md-nav__link> <span class=md-ellipsis> operator!= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/byte_container_with_subtype/set_subtype/ class=md-nav__link> <span class=md-ellipsis> set_subtype </span> </a> </li> <li class=md-nav__item> <a href=../../../api/byte_container_with_subtype/subtype/ class=md-nav__link> <span class=md-ellipsis> subtype </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_3> <div class="md-nav__link md-nav__container"> <a href=../../../api/adl_serializer/ class="md-nav__link "> <span class=md-ellipsis> adl_serializer </span> </a> <label class="md-nav__link " for=__nav_4_3 id=__nav_4_3_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_3_label aria-expanded=false> <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> <span class=md-ellipsis> from_json </span> </a> </li> <li class=md-nav__item> <a href=../../../api/adl_serializer/to_json/ class=md-nav__link> <span class=md-ellipsis> to_json </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../../api/json/ class=md-nav__link> <span class=md-ellipsis> json </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_5> <div class="md-nav__link md-nav__container"> <a href=../../../api/json_pointer/ class="md-nav__link "> <span class=md-ellipsis> json_pointer </span> </a> <label class="md-nav__link " for=__nav_4_5 id=__nav_4_5_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_5_label aria-expanded=false> <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> <span class=md-ellipsis> (Constructor) </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/back/ class=md-nav__link> <span class=md-ellipsis> back </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/empty/ class=md-nav__link> <span class=md-ellipsis> empty </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/front/ class=md-nav__link> <span class=md-ellipsis> front </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/operator_string_t/ class=md-nav__link> <span class=md-ellipsis> operator string_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/operator_eq/ class=md-nav__link> <span class=md-ellipsis> operator== </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/operator_ne/ class=md-nav__link> <span class=md-ellipsis> operator!= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/operator_spaceship/ class=md-nav__link> <span class=md-ellipsis> operator<=> </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/operator_slash/ class=md-nav__link> <span class=md-ellipsis> operator/ </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/operator_slasheq/ class=md-nav__link> <span class=md-ellipsis> operator/= </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/parent_pointer/ class=md-nav__link> <span class=md-ellipsis> parent_pointer </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/pop_back/ class=md-nav__link> <span class=md-ellipsis> pop_back </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/pop_front/ class=md-nav__link> <span class=md-ellipsis> pop_front </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/push_back/ class=md-nav__link> <span class=md-ellipsis> push_back </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/push_front/ class=md-nav__link> <span class=md-ellipsis> push_front </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/string_t/ class=md-nav__link> <span class=md-ellipsis> string_t </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_pointer/to_string/ class=md-nav__link> <span class=md-ellipsis> to_string </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_6> <div class="md-nav__link md-nav__container"> <a href=../../../api/json_sax/ class="md-nav__link "> <span class=md-ellipsis> json_sax </span> </a> <label class="md-nav__link " for=__nav_4_6 id=__nav_4_6_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_6_label aria-expanded=false> <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> <span class=md-ellipsis> binary </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/boolean/ class=md-nav__link> <span class=md-ellipsis> boolean </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/end_array/ class=md-nav__link> <span class=md-ellipsis> end_array </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/end_object/ class=md-nav__link> <span class=md-ellipsis> end_object </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/key/ class=md-nav__link> <span class=md-ellipsis> key </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/null/ class=md-nav__link> <span class=md-ellipsis> null </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/number_float/ class=md-nav__link> <span class=md-ellipsis> number_float </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/number_integer/ class=md-nav__link> <span class=md-ellipsis> number_integer </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/number_unsigned/ class=md-nav__link> <span class=md-ellipsis> number_unsigned </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/parse_error/ class=md-nav__link> <span class=md-ellipsis> parse_error </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/start_array/ class=md-nav__link> <span class=md-ellipsis> start_array </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/start_object/ class=md-nav__link> <span class=md-ellipsis> start_object </span> </a> </li> <li class=md-nav__item> <a href=../../../api/json_sax/string/ class=md-nav__link> <span class=md-ellipsis> string </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../../api/operator_ltlt/ class=md-nav__link> <span class=md-ellipsis> operator<<(basic_json), operator<<(json_pointer) </span> </a> </li> <li class=md-nav__item> <a href=../../../api/operator_gtgt/ class=md-nav__link> <span class=md-ellipsis> operator>>(basic_json) </span> </a> </li> <li class=md-nav__item> <a href=../../../api/operator_literal_json/ class=md-nav__link> <span class=md-ellipsis> operator""_json </span> </a> </li> <li class=md-nav__item> <a href=../../../api/operator_literal_json_pointer/ class=md-nav__link> <span class=md-ellipsis> operator""_json_pointer </span> </a> </li> <li class=md-nav__item> <a href=../../../api/ordered_json/ class=md-nav__link> <span class=md-ellipsis> ordered_json </span> </a> </li> <li class=md-nav__item> <a href=../../../api/ordered_map/ class=md-nav__link> <span class=md-ellipsis> ordered_map </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4_13> <div class="md-nav__link md-nav__container"> <a href=../../../api/macros/ class="md-nav__link "> <span class=md-ellipsis> macros </span> </a> <label class="md-nav__link " for=__nav_4_13 id=__nav_4_13_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_4_13_label aria-expanded=false> <label class=md-nav__title for=__nav_4_13> <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> <span class=md-ellipsis> JSON_ASSERT </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_brace_init_copy_semantics/ class=md-nav__link> <span class=md-ellipsis> JSON_BRACE_INIT_COPY_SEMANTICS </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_throw_user/ class=md-nav__link> <span class=md-ellipsis> JSON_CATCH_USER, JSON_THROW_USER, JSON_TRY_USER </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_diagnostics/ class=md-nav__link> <span class=md-ellipsis> JSON_DIAGNOSTICS </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_diagnostic_positions/ class=md-nav__link> <span class=md-ellipsis> JSON_DIAGNOSTIC_POSITIONS </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_disable_enum_serialization/ class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_ENUM_SERIALIZATION </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_disable_tuple_reference_conversion/ class=md-nav__link> <span class=md-ellipsis> JSON_DISABLE_TUPLE_REFERENCE_CONVERSION </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_has_cpp_11/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20, JSON_HAS_CPP_23, JSON_HAS_CPP_26 </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_has_filesystem/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_EXPERIMENTAL_FILESYSTEM, JSON_HAS_FILESYSTEM </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_has_ranges/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_RANGES </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_has_static_rtti/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_STATIC_RTTI </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_has_std_format/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_STD_FORMAT </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_has_three_way_comparison/ class=md-nav__link> <span class=md-ellipsis> JSON_HAS_THREE_WAY_COMPARISON </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_no_automatic_udls/ class=md-nav__link> <span class=md-ellipsis> JSON_NO_AUTOMATIC_UDLS </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_noexception/ class=md-nav__link> <span class=md-ellipsis> JSON_NOEXCEPTION </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_no_io/ class=md-nav__link> <span class=md-ellipsis> JSON_NO_IO </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_no_thread_local/ class=md-nav__link> <span class=md-ellipsis> JSON_NO_THREAD_LOCAL </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_precise_stream_position/ class=md-nav__link> <span class=md-ellipsis> JSON_PRECISE_STREAM_POSITION </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_skip_library_version_check/ class=md-nav__link> <span class=md-ellipsis> JSON_SKIP_LIBRARY_VERSION_CHECK </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_skip_unsupported_compiler_check/ class=md-nav__link> <span class=md-ellipsis> JSON_SKIP_UNSUPPORTED_COMPILER_CHECK </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_strict_nul_handling/ class=md-nav__link> <span class=md-ellipsis> JSON_STRICT_NUL_HANDLING </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_use_global_udls/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_GLOBAL_UDLS </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_use_implicit_conversions/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_IMPLICIT_CONVERSIONS </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_use_legacy_discarded_value_comparison/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/json_use_simdutf/ class=md-nav__link> <span class=md-ellipsis> JSON_USE_SIMDUTF </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_define_derived_type/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_define_type_intrusive/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_define_type_non_intrusive/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_define_type_with_names/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_WITH_NAMES, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_WITH_NAMES </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_json_namespace/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_NAMESPACE </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_json_namespace_begin/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_json_namespace_no_version/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_NAMESPACE_NO_VERSION </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_json_serialize_enum/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_SERIALIZE_ENUM </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_json_serialize_enum_strict/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_SERIALIZE_ENUM_STRICT </span> </a> </li> <li class=md-nav__item> <a href=../../../api/macros/nlohmann_json_version_major/ class=md-nav__link> <span class=md-ellipsis> NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_5> <div class="md-nav__link md-nav__container"> <a href=../../../community/ class="md-nav__link "> <span class=md-ellipsis> Community </span> </a> <label class="md-nav__link " for=__nav_5 id=__nav_5_label tabindex=0> <span class="md-nav__icon md-icon"></span> </label> </div> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_5_label aria-expanded=false> <label class=md-nav__title for=__nav_5> <span class="md-nav__icon md-icon"></span> Community </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../community/ecosystem/ class=md-nav__link> <span class=md-ellipsis> Ecosystem </span> </a> </li> <li class=md-nav__item> <a href=../../../community/code_of_conduct/ class=md-nav__link> <span class=md-ellipsis> Code of Conduct </span> </a> </li> <li class=md-nav__item> <a href=../../../community/contribution_guidelines/ class=md-nav__link> <span class=md-ellipsis> Contribution Guidelines </span> </a> </li> <li class=md-nav__item> <a href=../../../community/quality_assurance/ class=md-nav__link> <span class=md-ellipsis> Quality assurance </span> </a> </li> <li class=md-nav__item> <a href=../../../community/governance/ class=md-nav__link> <span class=md-ellipsis> Governance </span> </a> </li> <li class=md-nav__item> <a href=../../../community/roadmap/ class=md-nav__link> <span class=md-ellipsis> Roadmap </span> </a> </li> <li class=md-nav__item> <a href=../../../community/security_policy/ class=md-nav__link> <span class=md-ellipsis> Security Policy </span> </a> </li> <li class=md-nav__item> <a href=../../../community/assurance_case/ class=md-nav__link> <span class=md-ellipsis> Assurance case </span> </a> </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"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#errors-without-exceptions class=md-nav__link> <span class=md-ellipsis> Errors without exceptions </span> </a> </li> <li class=md-nav__item> <a href=#nesting-depth class=md-nav__link> <span class=md-ellipsis> Nesting depth </span> </a> </li> <li class=md-nav__item> <a href=#input-size class=md-nav__link> <span class=md-ellipsis> Input size </span> </a> </li> <li class=md-nav__item> <a href=#strings class=md-nav__link> <span class=md-ellipsis> Strings </span> </a> </li> <li class=md-nav__item> <a href=#duplicate-object-keys class=md-nav__link> <span class=md-ellipsis> Duplicate object keys </span> </a> </li> <li class=md-nav__item> <a href=#numbers class=md-nav__link> <span class=md-ellipsis> Numbers </span> </a> </li> <li class=md-nav__item> <a href=#comments-and-trailing-commas class=md-nav__link> <span class=md-ellipsis> Comments and trailing commas </span> </a> </li> <li class=md-nav__item> <a href=#checklist class=md-nav__link> <span class=md-ellipsis> Checklist </span> </a> </li> <li class=md-nav__item> <a href=#see-also class=md-nav__link> <span class=md-ellipsis> See also </span> </a> </li> </ul> </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/features/parsing/untrusted_input.md" title="Edit this page" class="md-content__button md-icon" rel="edit"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg> </a> <a href="https://github.com/nlohmann/json/raw/develop/docs/mkdocs/docs/features/parsing/untrusted_input.md" title="View source of this page" class="md-content__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M17 18c.56 0 1 .44 1 1s-.44 1-1 1-1-.44-1-1 .44-1 1-1m0-3c-2.73 0-5.06 1.66-6 4 .94 2.34 3.27 4 6 4s5.06-1.66 6-4c-.94-2.34-3.27-4-6-4m0 6.5a2.5 2.5 0 0 1-2.5-2.5 2.5 2.5 0 0 1 2.5-2.5 2.5 2.5 0 0 1 2.5 2.5 2.5 2.5 0 0 1-2.5 2.5M9.27 20H6V4h7v5h5v4.07c.7.08 1.36.25 2 .49V8l-6-6H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h4.5a8.2 8.2 0 0 1-1.23-2"/></svg> </a> <h1 id=parsing-untrusted-input>Parsing Untrusted Input<a class=headerlink href=#parsing-untrusted-input title="Permanent link">¶</a></h1> <p>This page is for applications that parse <abbr title="JavaScript Object Notation">JSON</abbr> -- or one of the supported <a href=../../binary_formats/ >binary formats</a> (<abbr title="Binary JData">BJData</abbr>, <abbr title="Binary Object Notation 8">BON8</abbr>, <abbr title="Binary JSON">BSON</abbr>, <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, <abbr title="Universal Binary JSON">UBJSON</abbr>) -- from a source they do not fully control, such as a network connection, an uploaded file, or another process. It summarizes what the library already does for such input and what remains the caller's responsibility, linking to the pages that cover each aspect in detail rather than repeating them.</p> <p>For the project's threat model and the countermeasures behind these behaviors, see the <a href=../../../community/assurance_case/ >assurance case</a>; to report a vulnerability, see the <a href=../../../community/security_policy/ >security policy</a>.</p> <h2 id=errors-without-exceptions>Errors without exceptions<a class=headerlink href=#errors-without-exceptions title="Permanent link">¶</a></h2> <p>By default, <a href=../../../api/basic_json/parse/ ><code>parse()</code></a> throws a <a href=../../../home/exceptions/#jsonexceptionparse_error101><code>parse_error</code></a> (for instance <code>parse_error.101</code> for a syntax error) when the input is not valid. If your environment cannot use exceptions for untrusted input, the library offers several alternatives; see <a href=../parse_exceptions/ >Parsing and exceptions</a> for the full comparison:</p> <ul> <li>Pass <code class=highlight><span class=nb>false</span></code> as the third argument to <code>parse()</code> to get a discarded value (checked with <a href=../../../api/basic_json/is_discarded/ ><code>is_discarded()</code></a>) instead of a thrown exception, with no diagnostic information.</li> <li>Use <a href=../../../api/basic_json/accept/ ><code>accept()</code></a> to only check whether the input is valid <abbr title="JavaScript Object Notation">JSON</abbr>, without building a value.</li> <li>Implement the <a href=../sax_interface/ ><abbr title="Simple API for XML">SAX</abbr> interface</a> and override <code>parse_error()</code> to react to an error yourself, with the byte position and the exception that would otherwise have been thrown; see the <a href=../parse_exceptions/#user-defined-sax-interface>example</a> that overrides it to print instead of throw.</li> </ul> <p>If exceptions are unavailable entirely (<code>-fno-exceptions</code>, or <a href=../../../api/macros/json_noexception/ ><code>JSON_NOEXCEPTION</code></a> defined), every <code class=highlight><span class=k>throw</span></code> in the library becomes a call to <code>std::abort()</code> -- there is no way to recover from a parse error of untrusted input in that configuration; see <a href=../../../home/exceptions/#switch-off-exceptions>Switch off exceptions</a> for the details and for overriding this with <code>JSON_THROW_USER</code>.</p> <h2 id=nesting-depth>Nesting depth<a class=headerlink href=#nesting-depth title="Permanent link">¶</a></h2> <p>The <abbr title="JavaScript Object Notation">JSON</abbr> parser and the binary readers are iterative: they keep the containers they are currently inside of on a heap-allocated stack instead of calling themselves once per nesting level, so the native call stack does not grow with the nesting depth of the input. A deeply nested document is therefore bounded by available memory, not by the call stack, however deeply it is nested.</p> <div class="admonition warning"> <p class=admonition-title>No built-in depth limit while parsing</p> <p>Neither the parser nor the binary readers impose a limit on how deep the input may nest. An attacker can still exhaust memory (though not the call stack) with a sufficiently deep document. If you need to reject over-deep untrusted input outright, track the depth yourself, either with a <a href=../parser_callbacks/#recipe-max-nesting-depth-via-a-callback>parser callback</a> for the <abbr title="JavaScript Object Notation">JSON</abbr> parser, or by counting <code>start_object</code>/<code>start_array</code> and <code>end_object</code>/<code>end_array</code> calls in a <a href=../sax_interface/ ><abbr title="Simple API for XML">SAX</abbr> handler</a> (for the <abbr title="JavaScript Object Notation">JSON</abbr> parser or a binary format alike) and throwing once your limit is exceeded.</p> </div> <p>Once a value has been parsed, operations that walk it recursively -- serializing it with <a href=../../../api/basic_json/dump/ ><code>dump</code></a>, hashing it, copying it, comparing two values with <code class=highlight><span class=o>==</span></code>, <code class=highlight><span class=o><</span></code>, or (in C++20) <code class=highlight><span class=o><=></span></code>, merging with <a href=../../../api/basic_json/update/ ><code>update</code></a>, and applying a <a href=../../../api/basic_json/merge_patch/ ><code>merge_patch</code></a> -- descend at most 128 levels on the call stack and continue below that with an explicit stack instead, so none of them can exhaust the stack either, however deeply the value is nested. Destroying a value (its destructor) never recurses at all, regardless of nesting depth, for the same reason.</p> <div class="admonition note"> <p class=admonition-title>Not every operation is bounded yet</p> <p><a href=../../../api/basic_json/diff/ ><code>diff</code></a>, <a href=../../../api/basic_json/flatten/ ><code>flatten</code></a>, and the binary writers (<code>to_cbor</code>, <code>to_msgpack</code>, ...) still recurse once per nesting level; this is called out as work in progress in the <a href=../../../community/assurance_case/#secure-design>assurance case</a>. A value deep enough to matter for these operations would typically first have to survive parsing without hitting a self-imposed depth limit, as described above.</p> </div> <h2 id=input-size>Input size<a class=headerlink href=#input-size title="Permanent link">¶</a></h2> <p>The library does not limit the overall size of a <abbr title="JavaScript Object Notation">JSON</abbr> text; a value nested or wide enough will use memory proportional to the input. If you parse untrusted input of unbounded size, check the size of the file or stream yourself before -- or while -- handing it to <code>parse()</code>.</p> <p>For the binary formats, an announced size is never trusted outright:</p> <ul> <li>Reading a string or binary value copies the input in bounded 4096-byte chunks and grows the result as bytes are actually consumed, rather than allocating the announced length up front -- a truncated input runs out of bytes (reported as a parse error) instead of triggering an oversized allocation.</li> <li>When an array announces its number of elements and the array container supports <code>reserve()</code> (as <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span></code>, the default, does), the library reserves storage for at most 16384 of them upfront, regardless of how large the announced count is; further elements still grow the container normally as they are read.</li> <li>An announced array or object size that exceeds what the target container could ever hold (its <code>max_size()</code>) is rejected immediately as <a href=../../../home/exceptions/#jsonexceptionout_of_range408><code>out_of_range.408</code></a>, without attempting to allocate anything.</li> </ul> <h2 id=strings>Strings<a class=headerlink href=#strings title="Permanent link">¶</a></h2> <p>Invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8 is rejected while parsing, not just while serializing:</p> <ul> <li>In <abbr title="JavaScript Object Notation">JSON</abbr> text, an ill-formed <abbr title="Unicode Transformation Format">UTF</abbr>-8 byte in a string is a <a href=../../../home/exceptions/#jsonexceptionparse_error101><code>parse_error.101</code></a> ("invalid string: ill-formed <abbr title="Unicode Transformation Format">UTF</abbr>-8 byte").</li> <li>In a binary format, a string that is not valid <abbr title="Unicode Transformation Format">UTF</abbr>-8 is a <a href=../../../home/exceptions/#jsonexceptionparse_error113><code>parse_error.113</code></a>.</li> </ul> <p>A <code class=highlight><span class=sc>'\0'</span></code> (NUL) byte <em>inside</em> a quoted <abbr title="JavaScript Object Notation">JSON</abbr> string is always rejected (it must be escaped as <code>\u0000</code>). A NUL byte <em>outside</em> of a string is different: by default it is silently treated as the end of the input, so trailing bytes after it -- including further, otherwise well-formed <abbr title="JavaScript Object Notation">JSON</abbr> -- are silently ignored rather than rejected. Since untrusted input that happens to embed a NUL is a way to make part of it disappear without a parse error, see the <a href=../../../home/faq/#nul-bytes-in-the-input><abbr title="Frequently Asked Questions">FAQ</abbr> entry</a> and consider defining <a href=../../../api/macros/json_strict_nul_handling/ ><code>JSON_STRICT_NUL_HANDLING</code></a> to <code>1</code> to reject a NUL byte like any other unexpected byte instead.</p> <p>Parsing is not the only place invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8 matters: a string that reached a <code class=highlight><span class=n>json</span></code> value some other way (for example, constructed by application code, or, before JSON_STRICT_NUL_HANDLING existed, read from a binary format that does not validate strings) still has to round-trip back to <abbr title="JavaScript Object Notation">JSON</abbr> text. By default, <a href=../../../api/basic_json/dump/ ><code>dump()</code></a> throws <a href=../../../home/exceptions/#jsonexceptiontype_error316><code>type_error.316</code></a> if the string is not valid <abbr title="Unicode Transformation Format">UTF</abbr>-8; passing <a href=../../../api/basic_json/error_handler_t/ ><code>error_handler_t::replace</code></a> or <code>error_handler_t::ignore</code> avoids the exception instead of crashing an application that forgot to catch it. See <a href=../../serialization/#handling-invalid-utf-8>Handling invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8</a> for the options and an example.</p> <h2 id=duplicate-object-keys>Duplicate object keys<a class=headerlink href=#duplicate-object-keys title="Permanent link">¶</a></h2> <p>The <abbr title="JavaScript Object Notation">JSON</abbr> specification leaves the handling of repeated keys in an object up to the implementation, and this library does too: as described in <a href=../../../api/basic_json/object_t/#behavior><code>object_t</code></a>, it is unspecified which of the values for a repeated key ends up in the parsed object. If your application must reject duplicate keys instead of silently resolving them one way or another, see the <a href=../parser_callbacks/#recipe-rejecting-duplicate-object-keys>parser callback recipe for rejecting duplicate keys</a>.</p> <h2 id=numbers>Numbers<a class=headerlink href=#numbers title="Permanent link">¶</a></h2> <p>A number whose value cannot be represented -- for instance <code>1E1000</code>, which overflows <code>double</code> -- is rejected while parsing as <a href=../../../home/exceptions/#jsonexceptionout_of_range406><code>out_of_range.406</code></a> rather than silently becoming infinity. An integer that is syntactically valid but does not fit the 64-bit integer types is not rejected; it is instead stored as a <code>double</code>, which may lose precision for very large values. See <a href=../../types/number_handling/#number-limits>number limits</a> for the exact ranges and an example.</p> <h2 id=comments-and-trailing-commas>Comments and trailing commas<a class=headerlink href=#comments-and-trailing-commas title="Permanent link">¶</a></h2> <p>Both <a href=../../comments/ >comments</a> and <a href=../../trailing_commas/ >trailing commas</a> are rejected by default, matching the <abbr title="JavaScript Object Notation">JSON</abbr> specification; they must be explicitly enabled per call with the <code>ignore_comments</code> and <code>ignore_trailing_commas</code> parameters of <a href=../../../api/basic_json/parse/ ><code>parse()</code></a> or <a href=../../../api/basic_json/accept/ ><code>accept()</code></a>. Do not enable either for input whose conformance you cannot otherwise control, since interoperability with strictly conforming <abbr title="JavaScript Object Notation">JSON</abbr> consumers is exactly what the default rejects.</p> <h2 id=checklist>Checklist<a class=headerlink href=#checklist title="Permanent link">¶</a></h2> <ul> <li>Wrap parsing in a <code class=highlight><span class=k>try</span></code>/<code class=highlight><span class=k>catch</span></code> block, or use <code>allow_exceptions=false</code>/<code>accept()</code> if your environment cannot use exceptions; never let <code>JSON_NOEXCEPTION</code>'s <code>abort()</code> be the first time you think about error handling.</li> <li>If the input's nesting depth matters to you, enforce your own limit with a <a href=../parser_callbacks/#recipe-max-nesting-depth-via-a-callback>parser callback</a> or a <a href=../sax_interface/ ><abbr title="Simple API for XML">SAX</abbr> handler</a>; the library bounds the call stack but not memory use.</li> <li>Bound the size of the input itself before parsing, independent of the library's own bounded allocations for binary format lengths.</li> <li>Decide up front how you want a string with invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8 -- from any source, not only parsing -- to be serialized (<code>strict</code>, <code>replace</code>, or <code>ignore</code>), rather than discovering it from an uncaught <code>type_error.316</code>.</li> <li>If a stray NUL byte silently truncating trailing input is a problem for your input format, define <code>JSON_STRICT_NUL_HANDLING</code>.</li> <li>Decide whether duplicate object keys should be an error for your application, and add a callback if so.</li> <li>Do not enable <code>ignore_comments</code> or <code>ignore_trailing_commas</code> for input that must be strictly conforming <abbr title="JavaScript Object Notation">JSON</abbr>.</li> </ul> <p>For the broader design rationale and how it is tested (fuzzing, sanitizers, static analysis), see the <a href=../../../community/assurance_case/ >assurance case</a> and <a href=../../../community/quality_assurance/ >quality assurance</a>. To report a security issue in the library itself, follow the <a href=../../../community/security_policy/ >security policy</a>.</p> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../ >Parsing</a> - overview of the parsing functions</li> <li><a href=../parse_exceptions/ >Parsing and exceptions</a> - error handling without exceptions</li> <li><a href=../parser_callbacks/ >Parser callbacks</a> - depth limits, duplicate-key rejection, and streaming recipes</li> <li><a href=../sax_interface/ ><abbr title="Simple API for XML">SAX</abbr> interface</a> - implement a custom handler with access to parse errors and positions</li> <li><a href=../../serialization/ >Serialization</a> - handling invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8 when dumping</li> <li><a href=../../types/number_handling/ >Number handling</a> - number ranges and overflow behavior</li> <li><a href=../../../community/assurance_case/ >Assurance case</a> - the library's threat model and countermeasures</li> <li><a href=../../../community/security_policy/ >Security policy</a> - how to report a vulnerability</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 2, 2026 09:32:15 UTC">October 2, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var 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> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button 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 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <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 © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - 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