# v3.6.0

Released on 2019-03-20.

Feature release. All changes are backward-compatible.

- Reworks the [JSON pointer](../../features/json_pointer.md) interface (`operator/`, `push_back`,
  `parent_pointer`, …).
- Adds a [`contains`](../../api/basic_json/contains.md) function to test for an object key and greatly
  improves the performance of integer serialization.

[Full release notes](https://github.com/nlohmann/json/releases/tag/v3.6.0).

## API changes

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