jsonSchema4s is a simple library for generating a simple json schema from a case class with http://json-schema.org/ format.
The base method is JsonSchemaGenerator.generateSchema and it returns a JsonSchemaElement ready to be serialized to json to generate the respecting json schema.
The json serialization it's not provided due to not adding extra dependencies, use the JsonSchemaElement on a more complex class to be serializated and also if you already have a json serializer you can use it. (Note: the serialization was tested with https://github.com/json4s/json4s)
import com.despegar.library.serialization.json._
val schema: JsonSchemaElement = JsonSchemaGenerator.generateSchema[ACaseClass]
// You need to use your own scala json serializer
val schemaAsJson = someSerializer.serialize(schema)
...The library supports case class, Option[A], Seq[A], String, Boolean, Int, Long, BigDecimal.
These were the only ones implemented just by the need
It's experimental due to scala reflection universal api. The recommended use is for documentation purposes.