Convert JSON to TypeScript, Dart, Python, Go & More
Stop hand-writing model classes for API responses. This free JSON to code converter turns any JSON object or array into clean, ready-to-use type definitions in one click — TypeScript interfaces, Dart classes with fromJson/toJson, Python dataclasses, Go structs, Kotlin data classes, C# classes, or Rust serde structs. Paste a sample response from your REST API, GraphQL endpoint, or config file, and drop the generated models straight into your codebase.
The generator walks the entire JSON structure — nested objects, arrays, mixed types, and null values — and produces idiomatic code for your chosen language with proper class names and correct primitive types. Flutter developers get Dart models with ready-made JSON serialization; backend engineers get Go structs with json tags or Rust structs with serde derives. It is the fastest way to add type safety to fetch calls, HTTP clients, and third-party API integrations without tedious manual typing.
How to Generate Typed Models from JSON
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Paste a JSON sample
Copy a representative JSON payload — an API response or data object — into the input editor.
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Pick your target language
Choose TypeScript, Dart, Python, Go, Kotlin, C#, or Rust from the language dropdown above the output.
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Review the output
The converter instantly analyzes the structure and produces matching classes. Rename the root type and verify nested structures were inferred correctly.
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Copy into your project
Copy the generated code and paste it into your source file for immediate type safety and serialization.
Key Features of the JSON to Code Converter
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Seven target languages
Generate TypeScript, Dart, Python, Go, Kotlin, C#, or Rust models from the same JSON without leaving the page.
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Dart with JSON serialization
JSON to Dart output includes constructors plus fromJson and toJson methods, ready for Flutter apps.
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Nested object support
Deeply nested JSON produces separate, properly named classes for every level of the structure.
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Array & type inference
Arrays of objects become typed collections with a shared element class, and int vs. double are distinguished for typed languages.
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Private by design
Your JSON is processed locally in the browser and never uploaded, so proprietary API shapes stay confidential.
Frequently Asked Questions
How do I convert JSON to a Dart class?
Paste your JSON, select Dart from the language dropdown, and the tool generates Dart classes with a constructor, fromJson factory, and toJson method — ready to use in Flutter without any extra packages.
Which languages can I convert JSON to?
You can generate TypeScript interfaces, Dart classes, Python dataclasses, Go structs, Kotlin data classes, C# classes, and Rust serde structs, all from the same JSON input.
Does the converter handle nested JSON objects?
Yes. Every nested object becomes its own named class or struct, and arrays of objects are typed with a shared element type, mirroring how you would write the models by hand.
Does the Go and Rust output include serialization tags?
Yes. Go structs get `json:"..."` tags and Rust structs get serde derives with rename attributes where the field name differs from the JSON key, so they deserialize correctly out of the box.
Is this better than writing models manually?
For large or deeply nested payloads it is dramatically faster and less error-prone. You can always fine-tune the generated code afterward — the tool does the heavy lifting.