# v3.10.0

Released on 2021-08-17.

Feature release. All changes are backward-compatible.

- Adds [extended diagnostic messages](../../api/macros/json_diagnostics.md)
  ([`JSON_DIAGNOSTICS`](../../api/macros/json_diagnostics.md)) that prepend a JSON pointer to exception
  messages to pinpoint the offending value.
- Adds a GDB pretty-printer and a [`cbor_tag_handler_t`](../../api/basic_json/cbor_tag_handler_t.md)
  `store` option to keep CBOR tags as binary subtypes.
- Supports containers with non-default-constructible types and parsing from `std::byte`.
- Adds [`JSON_NO_IO`](../../api/macros/json_no_io.md) to exclude the I/O headers and the
  [`JSON_HAS_CPP_*`](../../api/macros/json_has_cpp_11.md) macros to override the detected C++ standard.

[Full release notes](https://github.com/nlohmann/json/releases/tag/v3.10.0).

## API changes

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