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An object is used after it's moved

kind: bug

state: needs more infothe author of the issue needs to provide more detailsthe author of the issue needs to provide more details

Status: Open.

#5013 In nlohmann/json;

· Alexander-kalex opened on Nov 24, 2025

error_handler_t::ignore documentation is incorrect

kind: bug

Status: Open.

#5012 In nlohmann/json;

· rakshasa opened on Nov 24, 2025

MSVC / Modules compatibility

platform: visual studiorelated to MSVCrelated to MSVC

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

Status: Open.

#5010 In nlohmann/json;

· nlohmann opened on Nov 23, 2025

Serialization of double type data gets stuck

kind: bug

state: needs more infothe author of the issue needs to provide more detailsthe author of the issue needs to provide more details

Status: Open.

#5005 In nlohmann/json;

· zhaoyuRobotics opened on Nov 20, 2025

VS2026 Insiders, C2678 With C++23 Modules

kind: bug

platform: visual studiorelated to MSVCrelated to MSVC

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

Status: Open.

#5002 In nlohmann/json;

· ToddThomson opened on Nov 18, 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

Assertion error when converting to and from BJdata

aspect: binary formatsBSON, CBOR, MessagePack, UBJSONBSON, CBOR, MessagePack, UBJSON

confirmed

kind: bug

Status: Open.

#4925 In nlohmann/json;

· jkrshnmenon opened on Sep 19, 2025

Constructing array from C++20 ranges view does not work

kind: bug

Status: Open.

#4916 In nlohmann/json;

· stevenwdv opened on Sep 11, 2025

stack overflow

aspect: binary formatsBSON, CBOR, MessagePack, UBJSONBSON, CBOR, MessagePack, UBJSON

confirmed

kind: bug

Status: Open.

#4901 In nlohmann/json;

· 0dayhunter777 opened on Aug 22, 2025

Different results on Linux vs Windows when using json["str"].push_back({json::object})

documentation

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.

#4898 In nlohmann/json;

· jtl7913 opened on Aug 20, 2025