JSON to Code
Generate typed code from JSON in 8 languages
JSON Input
Generated Code
Generate typed code in your team's language
Different teams ship in different languages, and JSON is usually the lingua franca between them. Generating typed code from a single JSON sample means a TypeScript frontend, a Python data team, and a Go backend can all consume the same payload with native types instead of stringly-typed maps.
Use the generator when you need to
Share types across polyglot services
Generate TypeScript, Python, Go, Java, C#, Kotlin, Rust, or Swift types from one canonical JSON sample.
Bootstrap a new client SDK
Skip writing models by hand — generate them once and focus on the request/response logic.
Type third-party API responses
When the upstream service has no SDK in your language, generate native types from a real response.
How to generate code from JSON
- 1
Paste the sample JSON into the editor.
- 2
Choose the target language and configure the root type name if needed.
- 3
Copy the generated code into your project or shared package.
Keep going
TypeScript-only output
Use the focused TypeScript generator if your stack is TS-only.
Generate a JSON Schema
Create a language-agnostic schema so every service validates the same payload at runtime.
Mock data for the generated types
Build fake data that matches the generated types for tests and prototypes.
Format the source
Make the input readable so the generated type names follow consistent casing.
Common code-generation workflows
Backend and mobile share a JSON contract; generate Go structs and Swift Codable types from the same sample.
Spin up a service that consumes an existing payload by generating models in its language of choice.
Cut maintenance work by generating data transfer objects whenever the upstream payload changes.
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Mock Data Generator
Generate realistic fake JSON data for testing and prototyping
Frequently Asked Questions
The tool generates typed code in 8 languages: TypeScript interfaces, Python dataclasses, Java POJOs, Go structs with json tags, C# classes with properties, Kotlin data classes, Rust structs with serde, and Swift Codable structs.
The generator analyzes each JSON value to determine its type. Strings become string types, integers become int/Int/i64, floats become float/Double/f64, booleans become bool/Boolean, null becomes the language's nullable type, and nested objects become named types.
Yes. Use the Root Type input field to change the name of the top-level generated type. Nested types are automatically named based on their JSON key names using PascalCase convention.
Nested objects automatically generate their own named types (classes, structs, or interfaces depending on the language). Arrays of objects generate a separate type for the array element, with the type name derived from the singularized key name.