JSON to Java
Convert JSON to Java POJO classes with getters and setters, ready for Jackson. Nested objects become classes. Runs entirely in your browser.
Paste JSON and click Generate to produce Java POJOs.
JSON input
Generated Java
What this tool does
This JSON to Java converter takes a JSON document and generates Java type definitions from its shape. It runs entirely in your browser — your data never leaves the page.
How it works
1. Infer types. Every value is inspected: strings, numbers, booleans, null, arrays and nested objects.
2. Merge shapes. Array items are merged so optional fields stay optional.
3. Name fields. Keys become valid target-language identifiers.
4. Emit code. Java definitions preserve original JSON keys.
Frequently asked questions
Are the classes Jackson-ready?
Yes. POJOs get getters and setters, plus the required java.util.List import for arrays.
How are arrays handled?
Arrays become List fields, with List imported automatically.
Does JSON to Java upload my data?
No. JSON to Java runs entirely in your browser — your input never leaves this page.
Is JSON to Java free to use?
Yes. JSON to Java is completely free, with no account and nothing to sign up for.