How to exclude a specific field from the serialization or object generation process in a data class?

In Kotlin data class, to exclude a specific field from serialization (for example, when using Gson or Moshi), you can use annotations that ignore this field. For instance, for Gson, @Transient or @Expose(serialize = false, deserialize = false) are used.

Example with @Transient:

data class User(
    val name: String,
    @Transient val password: String // this field will not be serialized
)

A field with the @Transient annotation will not be included in the serialized JSON and will not be considered when generating an object from JSON.

If Jackson is used, you can apply the @JsonIgnore annotation:

import com.fasterxml.jackson.annotation.JsonIgnore

data class User(
    val name: String,
    @JsonIgnore val password: String
)

Thus, the choice of annotation depends on the serialization library used.