Nesting understood
Objects and arrays become clearly named models with appropriate field types.
Instant • private • type-safe
Free JSON to code converter
Paste JSON and instantly generate strongly typed models with serialization helpers for TypeScript, Dart, Kotlin, Swift, Python, Java, C#, Go or Rust. Nested objects and arrays included.
JSON input
Valid JSON
Generated code
From JSON data to working models in seconds
Skip repetitive typing and start with clean structures and conversion helpers inferred from real JSON.
Serialization included
Generate language-appropriate helpers to parse JSON into models and serialize models back to JSON.
Nine languages
Generate TypeScript, Dart, Kotlin, Swift, Python, Java, C#, Go or Rust code to copy or download.
How to convert JSON to code
- Paste a valid JSON object into the input editor.
- Choose your target language and root type name.
- Select Generate code.
- Review, copy or download the models and JSON conversion helpers.
Useful, predictable type inference
Strings, numbers, booleans, nulls, arrays and nested objects are detected automatically. Array item types are inferred from the supplied examples.
The output also includes language-specific serialization and deserialization code. Review optionality, dependencies and API-specific rules before shipping.
JSON to code FAQ
Which languages are supported?
TypeScript, Dart, Kotlin, Swift, Python, Java, C#, Go and Rust are currently available.
Does the converter generate JSON serialization code?
Yes. Generated output includes language-appropriate helpers for converting JSON to models and models back to JSON.
Does my JSON leave the browser?
No. Parsing and code generation happen locally on your device.
Does it support nested JSON?
Yes. Nested objects generate separate named types, and arrays receive an inferred item type.
Is generated code production-ready?
It provides a clean foundation. Confirm required and optional fields, naming conventions, dependencies and serialization behavior before shipping.