JSON to Java Class Converter

Convert JSON to Java POJO classes online. Generate Java classes with getters, setters, and Lombok support. Free, fast, and private.

Root:

Lombok @Data

JSON 入力

Java

About JSON to Java Conversion

Java's strong type system requires defining classes before deserializing JSON data. Manually writing Java POJOs (Plain Old Java Objects) for complex JSON APIs is tedious and error-prone. This tool analyzes your JSON and generates complete Java class definitions with proper field types, constructors, getters, and setters. It supports Lombok's @Data annotation to reduce boilerplate. Nested objects become separate classes, arrays become List<Type>, and null values are handled with nullable types. All processing happens in your browser.

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How to Use

Paste your JSON data into the input panel
Set the root class name (default: Root)
Toggle Lombok support if desired
Copy the generated Java classes into your project

Common Use Cases

Creating Java POJOs from REST API responses
Generating model classes for Spring Boot applications
Building typed data models for Android apps
Quickly scaffolding Java classes from sample data

Frequently Asked Questions

How do I convert JSON to Java classes?

Paste your JSON data, set a root class name, and click Convert. The tool generates Java POJO classes with proper types, fields, constructors, getters, and setters.

What is the Lombok option?

When enabled, the tool adds Lombok's @Data annotation which auto-generates getters, setters, toString, equals, and hashCode methods, significantly reducing boilerplate code.

How are arrays handled?

JSON arrays are converted to List<Type> with appropriate generic types. The tool adds the java.util.List import automatically.

Can I use the generated classes directly?

Yes. The output is valid Java code ready to use with Jackson, Gson, or any JSON library. Just copy into .java files.