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JSON to Java POJO

Convert JSON data to Java POJO class definitions with getters/setters or Lombok annotations. Infer nested classes, List types, and boxed generics. Runs entirely in your browser — your data never leaves your machine.

json java converter pojo code-generator spring

Published May 29, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Paste any JSON data and instantly get Java POJO class definitions. The tool infers types from values, handles nested objects, arrays, null values, and mixed types. Configure the root class name, generate getters/setters or use Lombok @Data, and toggle private vs public fields.

Features

  • Getters/Setters generation: public String getName() / public void setName(String name) by default
  • Lombok support: @Data annotation with import lombok.Data; — skip the boilerplate
  • Private/public fields: toggle field visibility to match your team’s style
  • Nested class inference: objects within objects generate separate named classes
  • Accurate type mapping: String, int, double, boolean, Object, List<T>
  • Boxed generics: List<Integer>, List<Double>, List<Boolean> for primitive array elements
  • List handling: homogeneous arrays get typed elements, mixed arrays use List<Object>
  • import java.util.List: added only when List is used
  • 5 example payloads: simple, nested, array, API response, config file
  • Private: runs entirely in the browser — no data transmitted

Use Cases

  • Quickly generating Java model classes for REST API response data
  • Bootstrapping Spring Boot DTOs from JSON fixtures
  • Converting JSON config files to typed Java POJO classes
  • Learning how JSON structures map to Java types