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basic_json destructor allocates memory, violating noexcept semantics

kind: bug

Status: Open.

#5135 In nlohmann/json;

· EvanBalster opened on Apr 13, 2026

Compilation error occurs when using nlohmann::ordered_map

confirmed

kind: bug

Status: Open.

#5122 In nlohmann/json;

· wangbw1116 opened on Mar 29, 2026

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

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

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.

#5066 In nlohmann/json;

· karcherm opened on Jan 30, 2026

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

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

kind: bug

Status: Open.

#4916 In nlohmann/json;

· stevenwdv opened on Sep 11, 2025

C++17 std::optional feature not enabled

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

Status: Open.

#4864 In nlohmann/json;

· Stevan1996 opened on Jul 28, 2025

json::update() with merge_objects==true may trigger JSON_ASSERT for some objects

kind: bug

Status: Open.

#4813 In nlohmann/json;

· Vobraz opened on Jun 9, 2025

Binary formats invalid encoding for <discarded> values in arrays and objects

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

kind: bug

Status: Open.

#4714 In nlohmann/json;

· nebkat opened on Apr 1, 2025

UTF-8 invalid characters are not always ignored when dumping with error_handler_t::ignore

confirmed

documentation

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.

#4552 In nlohmann/json;

· gentooise opened on Dec 17, 2024

NLOHMANN_DEFINE_TYPE_* fails with zero members

confirmed

good first issue

kind: bug

Status: Open.

#4041 In nlohmann/json;

· dawinaj opened on May 23, 2023

NLOHMANN_JSON_SERIALIZE_ENUM defaulting to the first enum value is surprising behavior

good first issue

Status: Open.

#3992 In nlohmann/json;

· bear24rw opened on Mar 23, 2023