What does this tool do?
JSON to Java POJO analyzes a sample JSON document and generates the matching Java classes (POJOs). It produces the correct Java type for each field along with proper getter/setter accessors, removing the chore of hand-writing model classes for developers building Spring Boot, Android, or general Java backend projects.
How to use it
- Paste or type your data into the left field.
- The result is generated instantly on the right.
- Use the Copy button to grab the output.
Fields, getters, and setters
Each generated POJO consists of private fields plus public getter and setter methods that access them, following the JavaBeans convention so it works cleanly with libraries like Jackson or Gson. JSON keys are converted to camelCase field names to match Java naming conventions. Nested objects are split into separate classes, and arrays are modeled as List<T>. You can paste the output straight into your project and use it immediately.
Type mapping logic
The tool selects Java types based on the JSON values: int or long for whole numbers, double for decimals, String for text, and boolean for true/false. Null or ambiguous fields may use Object. Arrays are written according to their contents as List<String>, List<Integer>, or List<CustomClass> for nested objects. This mapping gives a working starting point that rarely needs manual edits for typical REST API responses.
Frequently asked questions
Do the generated classes include getters and setters?
Yes, standard getter and setter methods are produced for every field. If you prefer Lombok, you can delete them and add the @Data annotation instead.
How are JSON arrays modeled?
Arrays are modeled as List<T> based on the element type; a string array becomes List<String>, while an array of objects becomes a List of the generated custom class.
Are Jackson annotations added?
The output is plain POJO code. If a JSON key does not match the Java field name, you can add annotations such as @JsonProperty yourself after copying.
Is JSON to Java POJO free?
Yes. JSON to Java POJO and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. JSON to Java POJO works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.