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JSON to Java

Generate Java classes with getters, setters and nested static classes from JSON.

Generate Java classes

Result: —
Nested objects become public static inner classes, and every field gets a getter and a setter.

How to use the JSON to Java

  1. Paste a JSON sample into the input box.
  2. Set the name of the root class.
  3. Click Generate classes and copy the Java source.

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Frequently Asked Questions

Common questions about the free online json to java.

Paste a JSON sample, choose the root class name and click Generate classes. You get fields, getters, setters and nested static classes.
Keys become camel case fields, so a key such as first name turns into firstName with a getFirstName getter and a setFirstName setter.
Every nested object becomes a public static inner class named from the key path, so an address inside a user object becomes UserAddress.
Arrays become List types with the matching element class, and the java.util.List import is added at the top of the generated file.
A field that can be null uses a boxed type such as Integer or Double instead of a primitive, so a missing value stays legal.
No. The generated code only uses java.util.List, so it compiles with a standard Java development kit and no build changes.
No. The classes are generated locally in your browser and nothing is sent anywhere.
Invalid JSON, or a sample that is neither an object nor an array, produces a clear error message instead of code.

Last updated: October 10, 2026