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Build issue when compiling with gcc (any modules-capable version) in a C++ modules project

kind: bug

Status: Open.

#5103 In nlohmann/json;

· sebsjames opened on Mar 9, 2026

Doxygen tag for requirement is incorrectly specifying The as requirement ID

Status: Open.

#5095 In nlohmann/json;

· krissrex opened on Mar 3, 2026

Copy constructor changes semantics

kind: bug

solution: wontfixthe issue will not be fixed (either it is impossible or deemed out of scope)the issue will not be fixed (either it is impossible or deemed out of scope)

Status: Open.

#5074 In nlohmann/json;

· mbrucher opened on Feb 9, 2026

Using json_pointer causes the warning of deprecated declarations

kind: bug

Status: Open.

#5068 In nlohmann/json;

· zheng-yu-yang opened on Feb 4, 2026

MSVC: unexpected behaviour converting from json to a rvalue reference of a variant containing a type that can be constructed from a string

kind: bug

Status: Open.

#5066 In nlohmann/json;

· karcherm opened on Jan 30, 2026

function argument safety check silently optimized out in release build by clang

kind: bug

state: please discussplease discuss the issue or vote for your favorite optionplease discuss the issue or vote for your favorite option

Status: Open.

#5048 In nlohmann/json;

· risa2000 opened on Jan 7, 2026

get enum with default value

kind: bug

solution: proposed fixa fix for the issue has been proposed and waits for confirmationa fix for the issue has been proposed and waits for confirmation

state: stalethe issue has not been updated in a while and will be closed automatically soon unless it is updatedthe issue has not been updated in a while and will be closed automatically soon unless it is updated

Status: Open.

#5036 In nlohmann/json;

· IamRezaMousavi opened on Dec 20, 2025

std::map and std::unordered_map serialization broken for keys of type std::u16string

kind: bug

solution: proposed fixa fix for the issue has been proposed and waits for confirmationa fix for the issue has been proposed and waits for confirmation

state: please discussplease discuss the issue or vote for your favorite optionplease discuss the issue or vote for your favorite option

state: stalethe issue has not been updated in a while and will be closed automatically soon unless it is updatedthe issue has not been updated in a while and will be closed automatically soon unless it is updated

Status: Open.

#5023 In nlohmann/json;

· mehecip opened on Dec 3, 2025

error_handler_t::ignore documentation is incorrect

documentation

kind: bug

state: stalethe issue has not been updated in a while and will be closed automatically soon unless it is updatedthe issue has not been updated in a while and will be closed automatically soon unless it is updated

Status: Open.

#5012 In nlohmann/json;

· rakshasa opened on Nov 24, 2025

Tests don't build with VS 2026

kind: bug

platform: visual studiorelated to MSVCrelated to MSVC

state: help neededthe issue needs help to proceedthe issue needs help to proceed

Status: Open.

#4996 In nlohmann/json;

· t-b opened on Nov 14, 2025

[MSVC][build] JSON failed with error C2672: 'nlohmann::json_abi_v3_12_0::basic_json<std::map,std::vector,std::string,bool,int64_t,uint64_t,double,

kind: bug

platform: visual studiorelated to MSVCrelated to MSVC

state: help neededthe issue needs help to proceedthe issue needs help to proceed

Status: Open.

#4974 In nlohmann/json;

· QuellaZhang opened on Oct 30, 2025

Natvis file for version 3.12.0 does not contain a type definition for detail::json_default_base

kind: bug

solution: proposed fixa fix for the issue has been proposed and waits for confirmationa fix for the issue has been proposed and waits for confirmation

state: waiting for PR

Status: Open.

#4972 In nlohmann/json;

· sakuntalle opened on Oct 29, 2025