Kotlin Data Class Generator

Transform your JSON, CSV, or database schemas into properly formatted Kotlin data classes instantly. Our generator handles nullable types, default values, and popular annotations including Gson @SerializedName, Room @Entity, and Kotlinx Serialization. Perfect for Android developers and Kotlin backend engineers.

Nullable Types Default Values Annotations Support Room & Gson Support

Quick Examples

DATA: data class User(val name: String)
NULLABLE: val email: String?
ANNOTATION: @SerializedName("user_name")

Input Type

Input Data

Configuration

Class Name

Package Name (Optional)

Annotations

@SerializedName (Gson)

@Entity (Room Database)

@Serializable (Kotlinx)

@Parcelize (Android)

Options

Make fields nullable by default

Generate default values

Use val (immutable)

Sample Data

Generated Kotlin Code

// Your generated Kotlin data class will appear here
//
// Click on one of the sample buttons to get started, or paste your own data
//
// Example output:
// data class User(
//     val id: Int,
//     val name: String,
//     val email: String?
// )

Generation Statistics

Fields

Annotations

Lines of Code

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

What features does the Kotlin Data Class Generator offer?

This tool generates Kotlin data classes from JSON, CSV, or SQL schemas with support for nullable types, default values, and popular annotations including @SerializedName (Gson), @Entity (Room), @Serializable (Kotlinx), and @Parcelize (Android). Perfect for rapid Android and Kotlin development.

How do I generate a Kotlin data class from my data?

Simply paste your JSON object, CSV data, or SQL CREATE TABLE statement into the input area and the tool will instantly generate a properly formatted Kotlin data class. You can customize the output with various options like nullability, annotations, and immutability settings.

Is this Kotlin generator compatible with all Kotlin versions?

Yes, the generated code is compatible with Kotlin 1.3 and above. The tool supports modern Kotlin features and follows current best practices including null safety, data classes, and standard library functions.

What are the limitations of the data class generation?

The tool handles standard data types and single-level nested objects. For complex nested structures in JSON, you may need to generate multiple classes. SQL parsing supports common column types but may require adjustment for database-specific types.

Can I generate Room database entities with this tool?

Absolutely! Enable the @Entity annotation option to generate Room-compatible data classes. The tool automatically adds @PrimaryKey to fields named "id" and includes proper Room imports. You can also combine this with other annotations like @SerializedName for API responses.