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 para código

Gera código tipado a partir de JSON em 8 linguagens

Entrada JSON

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Código gerado

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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Perguntas frequentes

A ferramenta gera código tipado em 8 linguagens: interfaces TypeScript, dataclasses Python, POJOs Java, structs Go com json tags, classes C# com properties, data classes Kotlin, structs Rust com serde e structs Swift Codable.

O gerador analisa cada valor do JSON para determinar o tipo. Strings viram tipos string, inteiros viram int/Int/i64, floats viram float/Double/f64, booleanos viram bool/Boolean, null vira o tipo anulável da linguagem, e objetos aninhados viram tipos nomeados.

Sim. Use o campo Root Type para mudar o nome do tipo gerado no nível mais alto. Tipos aninhados são nomeados automaticamente a partir das chaves do JSON usando a convenção PascalCase.

Objetos aninhados geram automaticamente seus próprios tipos nomeados (classes, structs ou interfaces, dependendo da linguagem). Arrays de objetos geram um tipo separado para o elemento do array, com o nome derivado da chave (no singular).