GenCodec serializes byte arrays to a base16 encoded string

[plokhotnyuk]

It should be documented somewhere in the GenCodec docs: https://github.com/AVSystem/scala-commons/blob/master/docs/GenCodec.md

How this representation can be altered to JSON arrays of numbers or base64 encoded strings?

[ghik]

It's more an implementation detail of JsonStringInput/Output rather than GenCodec itself. The solution would be to make JsonStringInput/Output more generic/configurable. You could also provide your own implementations of JSON input/output by e.g. subclassing JsonStringInput/Output and overriding read/writeObject, read/writeList and read/writeBinary in an appropriate way.

[ghik]

Fixed as part of #66 in #74, byte arrays are serialized as JSON arrays of signed byte numeric values by default. This can be configured using JsonOptions - the other format to choose is hex string.