JSON to Code
Free online JSON to code converter. Generate TypeScript, Go, Rust, Kotlin and Dart types from JSON. Type-safe code from your API responses instantly.
How to Use JSON to Code
Paste JSON Data
Paste any JSON object. The tool analyzes the structure and generates typed code in your selected language — TypeScript interfaces, Go structs, Rust structs, Kotlin data classes, or Dart classes.
Choose the Language
Select the target language from the dropdown. Each language has its own type conventions — optional fields, nullable types, and naming conventions are handled appropriately.
Copy the Code
The generated code is ready to paste into your project. Types are properly named, nested objects become nested types, and arrays use the correct generic syntax for each language.
Frequently Asked Questions
How does JSON to type conversion work?
The tool infers types from your JSON values: strings become String, numbers become Int/Float (auto-detected), booleans become Bool, arrays become List/Array generics, and nested objects become nested types. If a value is null, the field is marked as optional. The root object determines the top-level type name.
Can I customize the generated type names?
The root type defaults to "Root". For nested objects, type names are derived from their parent keys. For production use, rename the generated types to match your domain. The tool generates structural types, not semantic ones — you know what "UserProfile" means, the tool only knows it's an object with string and number fields.