JSON to class
Turn JSON into a useful starting point for a data class.
JSON to Data Class
Generate TypeScript interfaces, Python dataclasses, or Kotlin data classes from JSON. Perfect for API response typing and data modeling.
How It Works
Paste your JSON object in the input area
Select your target language from 8 options
Copy the generated class when it is ready
Features
Frequently Asked Questions
Is this tool really free?
Yes, 100% free with no hidden costs or limits. All processing happens.
Do I need an account?
No. The tool is free to use with no sign-up, no watermark and no limits.
What languages are supported?
We support TypeScript, Python, Java, C#, Go, Kotlin, and PHP. All with proper type annotations and idiomatic code style.
JSON to Class Generator, The Complete Guide
Convert JSON to TypeScript, Python, Kotlin, and more with our free JSON to code generator. Instantly generate class from JSON data, saving hours of manual type definition and reducing errors in your codebase.
JSON to TypeScript Interfaces
Generate JSON to interface definitions for TypeScript. Paste your API response JSON and get properly typed interfaces with optional properties, nested types, and arrays all correctly defined. Essential for type-safe frontend development.
JSON to Python Class
Convert JSON to Python class definitions including dataclasses and Pydantic models. Our generator creates properly typed Python code with type hints, making it easy to work with API responses and maintain type safety in Python projects.
JSON to Kotlin Data Classes
Generate JSON to Kotlin data classes instantly. Perfect for Android development with Retrofit, our converter creates nullable types where appropriate and handles nested objects correctly for seamless JSON parsing.
Tips for JSON to Code Conversion
- Use realistic sample JSON with all possible fields
- Include null values to generate optional/nullable types
- Review generated code for appropriate naming conventions
- Test with edge cases in your actual data
Related Tools
More than a quick json to class.
JSON to class turns a sample JSON object into a useful starting point for typed application code. It can save time when you are modelling an API response, defining a data object, or preparing a test fixture in a supported language.
The generated code is a draft, not a substitute for application design. Review optional fields, date strings, IDs, nested objects, naming conventions, and validation rules before committing it to a project.
How to use the json to class.
Start with the tool above. There is no account step between you and the result.
- 01
Paste a representative JSON object.
- 02
Choose the target language and root class name.
- 03
Review the generated class and adapt it to your project.
JSON to class answers.
Useful context before you use the result somewhere important.
Will this understand every API rule?
No. It infers types from the JSON you provide, so you should review optional values and domain-specific rules.
Why should I use representative JSON?
A realistic sample helps the generator infer nested objects, arrays, and value types more accurately.
Can I change the class name?
Yes. Set the root class name before copying the generated code.
Give the document a place to go.
Keep PDFs, templates, feedback, approvals and signatures together in one workspace.