Macros

!!! note

This page is under construction. See the [macro overview page](../../features/macros.md) until then.

Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header.

JSON_ASSERT(x) - control behavior of runtime assertions
JSON_CATCH_USER(exception)
JSON_DIAGNOSTICS - control extended diagnostics
JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20
JSON_HAS_FILESYSTEM/JSON_HAS_EXPERIMENTAL_FILESYSTEM - control std::filesystem support
JSON_NOEXCEPTION
JSON_NO_IO
JSON_SKIP_UNSUPPORTED_COMPILER_CHECK - do not warn about unsupported compilers
JSON_THROW_USER(exception)
JSON_TRY_USER
JSON_USE_IMPLICIT_CONVERSIONS
NLOHMANN_DEFINE_TYPE_INTRUSIVE(type, member...)
NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(type, member...)
NLOHMANN_JSON_SERIALIZE_ENUM(type, ...)
NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH