JSON to Kotlin Converter: Generate Kotlin Data Classes Instantly

Working with JSON in Kotlin can be repetitive, especially for large or nested structures. Our JSON-to-Kotlin tool automatically converts JSON into ready-to-use Kotlin data classes, saving time and ensuring accuracy.

Why Developers Need a JSON-to-Kotlin Tool

Manually converting JSON to Kotlin:

• Can introduce syntax errors
• Requires creating nested data classes manually
• Becomes complex for deeply nested objects or arrays
• Slows down development and prototyping

Automation ensures error-free Kotlin code, consistency, and faster workflow.

Key Features of JSON-to-Kotlin Tool

• Converts JSON into Kotlin data classes
• Supports nested objects and arrays
• Automatically adds type inference and null safety
• Works with JSON files or URLs
• Provides copy and download options

How the JSON-to-Kotlin Tool Works

Step 1: Paste JSON

Insert your JSON in the left panel.

Step 2: Click Convert

Press the Convert button in the center.

Step 3: View Output

Generated Kotlin code appears on the right panel, ready to copy or download.

Example: Simple JSON Conversion

Input JSON:

{
  "id": 1,
  "name": "LangStop",
  "tags": ["json", "kotlin", "converter"]
}

Generated Kotlin Data Class:

data class Data(
    val id: Int,
    val name: String,
    val tags: List<String>
)

Example: Nested JSON Conversion

Input JSON:

{
  "user": {
    "id": 101,
    "profile": {
      "age": 25,
      "email": "user@example.com"
    }
  }
}

Generated Kotlin Data Classes:

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

Benefits of Using JSON-to-Kotlin Tool

• ✅ Save Time – Convert JSON instantly
• ✅ Reduce Errors – Proper Kotlin syntax guaranteed
• ✅ Boost Productivity – Focus on logic, not boilerplate
• ✅ Clean and Readable Code – Well-structured data classes

Best Practices for Kotlin Developers

• Validate JSON using online validators before conversion
• Use descriptive class names for clarity
• Split large JSON into manageable data classes
• Reuse generated classes across your team projects

Integrating Generated Kotlin Classes Into Your Project

1. Copy the generated data classes
2. Paste them directly into your Kotlin project
3. Use serialization libraries like kotlinx.serialization or Gson:

import kotlinx.serialization.*
import kotlinx.serialization.json.*
 
val jsonString = """{"id":1,"name":"LangStop"}"""
val data = Json.decodeFromString<Data>(jsonString)
println(data.name) // "LangStop"

Step-by-Step How-to Guide

1. Paste your JSON in the left panel
2. Click Convert in the center
3. Review generated Kotlin code on the right panel
4. Copy or download your data classes
5. Import and use in your Kotlin project

FAQ (Frequently Asked Questions)

Q: Can this tool handle nested arrays? A: Yes, nested arrays are converted to Kotlin List types automatically.

Q: Can I customize nullability? A: Yes, you can configure optional fields to be nullable.

Q: Can I import JSON from a URL? A: Yes, paste the URL and the tool fetches and converts the JSON automatically.

Q: Does it support Kotlinx Serialization annotations? A: Yes, you can enable serialization annotations in the settings.

Q: Can I convert large JSON files? A: Yes, large and complex JSON structures are fully supported.

Related Developer Tools

• JSON to Java – Generate Java classes from JSON
• JSON to TypeScript – Generate TypeScript interfaces from JSON
• JSON Formatter & Validator – Format and validate JSON easily

Get Started Today

Stop manually converting JSON. Use our JSON-to-Kotlin tool to save time, reduce errors, and streamline your Kotlin development workflow.

Try JSON-to-Kotlin Now