What languages does the JSON to Code generator support?

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.

How does the tool infer types from JSON?

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.

Can I customize the root type name?

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.

How are nested objects and arrays handled?

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.

JSON a código

Genera código tipado desde JSON en 8 lenguajes

Entrada JSON

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Código generado

Root type:

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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

Generate matching models across stacks

Backend and mobile share a JSON contract; generate Go structs and Swift Codable types from the same sample.

Onboard a new microservice

Spin up a service that consumes an existing payload by generating models in its language of choice.

Replace hand-written DTOs

Cut maintenance work by generating data transfer objects whenever the upstream payload changes.

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Preguntas frecuentes

Genera código tipado en 8 lenguajes: interfaces TypeScript, dataclasses Python, POJOs Java, structs Go con json tags, clases C# con propiedades, data classes Kotlin, structs Rust con serde y structs Swift Codable.

El generador analiza cada valor JSON para determinar su tipo. Las cadenas se convierten en tipos string, los enteros en int/Int/i64, los decimales en float/Double/f64, los booleanos en bool/Boolean, null en el tipo nullable del lenguaje, y los objetos anidados en tipos con nombre.

Sí. Usa el campo Root Type para cambiar el nombre del tipo generado de nivel superior. Los tipos anidados se nombran automáticamente a partir de las claves JSON usando la convención PascalCase.

Los objetos anidados generan automáticamente sus propios tipos con nombre (clases, structs o interfaces según el lenguaje). Los arrays de objetos generan un tipo separado para el elemento del array, con el nombre derivado de la clave en singular.