Free JSON to Java Converter

How to Generate Java Classes from JSON

Paste your JSON into the left panel and Java class code appears instantly on the right. The converter maps JSON objects to Java classes with private fields and public getter/setter methods. Nested objects become separate classes, and arrays are typed as List<T>. You can customize the root class name and copy or download the generated code.

Common JSON to Java Use Cases

Use this tool when consuming REST APIs in Java and you need model classes for deserialization with Jackson or Gson, when scaffolding data transfer objects (DTOs) from API documentation, or when migrating JSON-based configurations to strongly-typed Java classes. The generated POJOs follow standard Java conventions and are ready to use with popular serialization libraries.

Frequently Asked Questions

What does it generate?

It generates Java POJOs (Plain Old Java Objects) with private fields, getter methods, and setter methods for each property in your JSON.

Does it handle arrays?

Yes — JSON arrays are mapped to List<T> in the generated Java code, with the appropriate element type inferred from the array contents.

Does it add imports?

Yes — when your JSON contains arrays, the generated code automatically includes the java.util.List import statement.

Can I customize the class name?

Yes — you can set a custom name for the root class. Nested classes are automatically named based on their property keys.

Is this converter free?

Yes — completely free, forever. No sign-up, no account, no usage limits.

Is my data safe?

All conversion happens locally in your browser using JavaScript. Your JSON is never uploaded to any server. It's safe to use with sensitive or proprietary data.