Summary - kotlinx.serialization

Combine @Serializable, Json and @SerialName to write an API model.

Summary - kotlinx.serialization

This group covered @Serializable, Json, @SerialName, @Optional and polymorphic serialization. They bridge Kotlin and JSON.

You add @Serializable to a class, produce JSON with Json.encodeToString, read with Json.decodeFromString, map field names with @SerialName, give defaults with @Optional, and do polymorphic serialization with sealed classes. Together they form a solid data exchange layer.

Exercise Summary: serialization

Define @Serializable data class User(val name: String). Inside main, set val user = User("Alex"), run val json = Json.encodeToString(user), and print println("Summary ready").

Show example solution

@Serializable
data class User(val name: String)

fun main() {
    val user = User("Alex")
    val json = Json.encodeToString(user)
    println("Summary ready")
}

Test yourself

Which method turns JSON into a Kotlin object?
- encodeToString
- decodeFromString
- toString
- stringify
Show answer

decodeFromString — decodeFromString turns JSON into an object.
Match all serialization concepts

@Serializable

Marks the class
Json

Produces and reads
@SerialName

Maps field name
@Optional

Default value
polymorphic

Type tag

Next lesson: Exposed

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies