# v3.11.3

Released on 2023-11-28.

Adds features and fixes bugs found in 3.11.2. All changes are backward-compatible.

- Adds a [custom base class](../../api/basic_json/json_base_class_t.md) as a node customization point.
- Adds serialization-only [conversion macros](../../features/macros.md)
  (`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE` and `NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE`)
  and a clearer parse error for empty input.
- Adds [Bazel](../../integration/package_managers.md#bazel) and
  [Swift Package Manager](../../integration/package_managers.md#swift-package-manager) build support.
- Fixes custom allocators, a memory leak in [`adl_serializer`](../../api/adl_serializer/to_json.md)'s
  `to_json`, initializer-list construction when `size_type` is not `int`, and many compiler warnings.

[Full release notes](https://github.com/nlohmann/json/releases/tag/v3.11.3).

## API changes

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