Serialize enums to lowercase

Is your feature request related to a problem? Please describe. Java enums are usually defined as UPPER_CASE_WITH_UNDERSCORE. This is not a standard in endpoints, as these rather use lower_case_with_underscore. There is already feature for ACCEPT_CASE_INSENSITIVE_ENUMS, which helps with deserialization, the feature for serialization is however currently missing. Only option is using @JsonProperty or toString() serialization.

Describe the solution you’d like I would like to have SerializationFeature.WRITE_ENUM_LOWERCASED.

Usage example Any API endpoint.

[knyttl]

Note that I solved it temporarily with custom serializer:

package net.goout.jackson

import com.fasterxml.jackson.core.JsonGenerator
import com.fasterxml.jackson.databind.SerializerProvider
import com.fasterxml.jackson.databind.module.SimpleModule
import com.fasterxml.jackson.databind.ser.std.StdSerializer

val lowerCaseEnumJacksonSerializerModule = SimpleModule().also {
    val lowerCaseEnumKeySerializer = object : StdSerializer<Enum<*>>(Enum::class.java) {
        override fun serialize(value: Enum<*>?, json: JsonGenerator, provider: SerializerProvider) {
            json.writeFieldName(value?.name?.toLowerCase())
        }
    }
    val lowerCaseEnumValueSerializer = object : StdSerializer<Enum<*>>(Enum::class.java) {
        override fun serialize(value: Enum<*>?, json: JsonGenerator, provider: SerializerProvider) {
            json.writeString(value?.name?.toLowerCase())
        }
    }
    it.addKeySerializer(Enum::class.java, lowerCaseEnumKeySerializer)
    it.addSerializer(Enum::class.java, lowerCaseEnumValueSerializer)
}

[ZeroOne3010]

@cowtowncoder OK, no worries, thanks for the clarification! I can wait. 😃