Avoid serialize to null using Circe json serializer

问题

How to avoid serializing None to null using Circe json serializer? I am not able to force this library to skip serializing fields which are None. Is it possible to achieve?

回答1:

I found the solution. We can provide implicit variable of instance Printer with our configuration. https://github.com/circe/circe/blob/master/modules/core/shared/src/main/scala/io/circe/Printer.scala We can set dropNullKeys to null and everything is working like a charm.

来源：https://stackoverflow.com/questions/41721970/avoid-serialize-to-null-using-circe-json-serializer