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JSON to Java
Generate Java POJO classes from JSON
Features
POJO Generation
Paste JSON to generate matching Java classes with intelligent type mapping: string to String, int to Integer/Long, decimal to Double, boolean to Boolean.
Nested Object Splitting
Nested objects become inner static classes, keeping the hierarchy clear with type-safe field references.
List Generic Mapping
Object arrays map to List<ClassName>, primitive arrays to List<String>/List<Integer>, and heterogeneous arrays degrade to List<Object>.
Getter/Setter Generation
Every field gets standard getXxx()/setXxx() methods following JavaBean conventions, ready for Jackson/Gson serialization.
How to Use
Step 1: Paste JSON
Paste JSON data into the input area, or click "Load Sample" to try it instantly.
Step 2: Set class name
Customize the root class name (default RootObject); the generated output uses it as the main class name.
Step 3: Generate and copy
Click "Generate Java Classes" to get POJO code, then "Copy Result" to paste into your Java project.
常见问题
Is the JSON to Java tool free?
Yes, completely free with no registration or usage limits.
Will my data be sent to a server?
No. Parsing and class generation happen locally in your browser. Your data never leaves your device.
Can I use the generated classes directly?
Yes. They are standard JavaBeans (POJOs) with private fields and getter/setter methods, ready for Jackson, Gson and similar frameworks.
What if a field name conflicts with a Java keyword?
The tool automatically appends an underscore suffix (e.g. class becomes class_) to keep the generated code compilable.
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