Does json to kotlin data class online support nullable keys?

Null values in JSON produce nullable types in generated Kotlin so you can deserialize partial API responses safely.

Are kotlinx.serialization annotations added?

Output focuses on data class structure; add @Serializable and field annotations to match your serializer library.

Switch the output language to Swift to get Codable structs for cross-platform projects.

Android clients mapping REST or Firebase JSON need data classes that mirror server keys without manual boilerplate.

Paste a response sample, select Kotlin, and copy data classes with nested structures derived from objects and arrays.

Mobile teams align DTOs with backend contracts during sprint planning—no cloud upload of sensitive JSON.

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{"token":"eyJhbG","user":{"id":7,"email":"dev@example.com"}}

Kotlin data class sketch

data class User(
    val id: Int,
    val email: String
)

data class Model(
    val token: String,
    val user: User
)

Does json to kotlin data class online support nullable keys?: Null values in JSON produce nullable types in generated Kotlin so you can deserialize partial API responses safely.
Are kotlinx.serialization annotations added?: Output focuses on data class structure; add @Serializable and field annotations to match your serializer library.
Can I generate Swift Codable from the same payload?: Switch the output language to Swift to get Codable structs for cross-platform projects.