Cómo usar: JSON to Java
- Paste a JSON sample in the input — Java is already selected.
- Set the root type name and options such as optional fields and date detection.
- Copy the generated Java code into your project.
JSON to Java classes
Each JSON object becomes a Java class (or record) with typed fields; nested objects become their own classes and arrays become List<T>. Keys that aren’t valid Java identifiers are mapped with annotations, so the class works with Jackson (@JsonProperty) and Gson (@SerializedName).
Reading the JSON
With Jackson: new ObjectMapper().readValue(json, Root.class). Configure FAIL_ON_UNKNOWN_PROPERTIES to decide whether extra fields should be ignored. Whole numbers that may exceed 2³¹ are typed as long.
Private by design
The conversion runs entirely in your browser — API responses with customer or internal data are never uploaded.
También se busca como: json to java classes, convert json to java, java classes from json, json java generator.
Herramientas que combinan con: JSON to Java
- De JSON a tipos — Pega una respuesta de la API y obtén modelos listos para usar en 8 lenguajes: TypeScript, Python (dataclass, TypedDict o Pydantic), Go, Java, C#, Kotlin, Swift y Rust.
- Formateador JSON — Pega el código JSON para formatearlo, minimizarlo o validarlo.
- JSON Validator — Paste JSON to check whether it is valid.
- JSON Schema Validator — Paste a schema and some JSON to see exactly which values break which rule — or generate a starting schema from example data.
Preguntas frecuentes
How are nested JSON objects converted to Java?
Each nested object becomes its own named classe, named after its key, and referenced from the parent. Arrays become typed lists of the element type.
What happens with fields that are missing or null in some items?
When you paste an array of objects, fields that are missing or null in some items are marked optional (nullable), so the generated code matches real API responses.
Is my JSON uploaded?
No. The conversion runs entirely in your browser, so API responses with private data never leave your device.
¿Puedo instalar JSON to Java como aplicación web y utilizarla sin conexión?
Sí. JSON to Java es una aplicación web instalable (PWA): se instala desde el navegador, no se descarga desde una tienda de aplicaciones. Haz clic en «Instalar aplicación» en la parte superior de esta página en Chrome o Edge (Windows, macOS, Linux, ChromeOS) o, en Android, utiliza «Compartir» → «Añadir a la pantalla de inicio» en iPhone y iPad, o «Archivo» → «Añadir al Dock» en Safari 17+ en un Mac. A continuación, se abrirá en su propia ventana con su propio icono y, como se ejecuta íntegramente en tu navegador, seguirá funcionando sin conexión. Firefox en el ordenador de sobremesa no permite instalar aplicaciones web. Cómo funciona la instalación.