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JSON to Java Converter

Convert JSON data to Java POJO classes instantly with type inference and nested class support.

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Convert JSON to Java POJO Classes Instantly

The JSON to Java Converter transforms any valid JSON document into Java model classes ready to drop into your backend services, REST clients, or data mapping layers. Paste a JSON object, choose a root class name, and receive a fully typed set of Java classes with optional getters and setters generated for every field.

Each nested JSON object becomes its own Java class. JSON arrays become List<Type> fields, and primitive values are inferred as int, double, boolean, or String. The output is generated entirely client-side, so your JSON data never leaves your browser.

How to Use This JSON to Java Converter

  1. Paste your JSON into the input editor or upload a .json file.
  2. Set the root class name (defaults to Root) and an optional Java package.
  3. Toggle "Generate getters and setters" if you need fully encapsulated POJOs.
  4. Copy or download the generated Java classes and paste them into your project.

Type Inference Rules

  • Boolean values map to boolean.
  • Integers map to int; decimal numbers map to double.
  • Strings map to String; null maps to Object.
  • Nested objects produce a separate Java class with a PascalCase name derived from the parent key.
  • Mixed arrays merge to the most permissive shared type to keep the output compilable.

Why Use This Tool

  • Skip the manual class-by-class typing when consuming a new JSON API.
  • Reduce typos and inconsistent naming across nested data structures.
  • Quickly bootstrap DTOs for Jackson, Gson, or Moshi-based projects.
  • Work fully offline — every conversion runs in your browser.

Frequently Asked Questions

Is my JSON data sent to a server?

No. The converter runs entirely in your browser, so the JSON you paste never leaves your device.

Does the output include constructors and Lombok annotations?

The output focuses on field declarations and optional getters/setters. You can paste the result into your IDE and add Lombok (@Data, @Builder) or Jackson annotations as needed.

How are JSON arrays handled?

Arrays produce List<Type> fields. When the array contains objects, a new Java class is generated for the element shape. Mixed-type arrays are merged into the closest common Java type.

Can I set a custom Java package name?

Yes. Enter a package name like com.example.model and a matching package declaration is added to the top of the generated source.

What if my JSON root is an array?

The tool requires a JSON object at the root to derive a class. Wrap the array in an object with a descriptive key, for example {"items": [...]}, and the array will be converted to a List field on the new root class.

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