documentation shows that sealedFormat includes "type" key

[graingert]

Eg:

Json.parse("""{"i": 5, "s":"foo", "type": "X"}""").as[SomeAdt] == X(5,"foo")

but it's neither obeyed during parsing, nor included when formatting.

[bharatsingh-tc]

Facing the same issue, examples from the documentation are not working as intended. Type hints are not included within the Json generated by the library.

Here is a sample code for reproducing the bug with the latest version of play-json [2.6.9] and play-json-extensions [0.14.0]

[plokhotnyuk]

@Bharat1103 Try jsoniter-scala. It works exactly as you need with ADTs. Also, it is much safer and more efficient than Play-JSON.