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About This Tool
JSON to Java Classes Generator converts any JSON payload into well-structured Java POJO classes instantly, right in your browser for free. When working with REST APIs, backend services, or data migration pipelines, manually writing Java model classes from JSON responses takes time and introduces typo risks. This tool infers class names from JSON key paths, handles deeply nested objects by generating inner classes, converts JSON arrays to ArrayList with properly typed generics, and scaffolds standard getter and setter methods for every field.
How to Generate Java Classes from JSON
- Paste your JSON payload into the input editor.
- Review the generated Java POJO classes on the right.
- Copy the output or download it as a .java text file.
- Rename root class names to match your domain model.
- Add JPA, Jackson, or Lombok annotations as needed.
Features
- Generates nested inner classes from nested JSON objects.
- Converts JSON arrays to
List<T>with inferred element types. - PascalCase class names and camelCase field names following Java conventions.
- Includes public getter and setter methods for every field.
Common Use Cases
- Model REST API responses in Spring Boot or Jersey
- Scaffold Android Retrofit data models
- Create entity classes for JPA/Hibernate from JSON schemas
- Prototype data models before writing full Java code
- Map third-party API payloads to Java objects quickly
Frequently Asked Questions
How do I convert JSON to Java POJO class online for free?
Paste your JSON payload into the input editor. The tool instantly generates Java POJO class code with fields, getters, and setters on the right. Copy or download the output for free without any sign-up.
Does the generator create nested Java classes for nested JSON?
Yes. Nested JSON objects are converted to inner static classes inside the parent POJO, preserving the object hierarchy.
How are JSON arrays handled?
JSON arrays become `List<T>` fields with an inferred generic type. If the array contains objects, a corresponding inner class is generated for the element type.
Does the output include getters and setters?
Yes. Every field includes a public getter and setter method following Java naming conventions.
Can I use this for Android development or Spring Boot?
Yes. The generated POJOs are compatible with Android Retrofit/Gson and Spring Boot Jackson deserialization. You may add @JsonProperty or @SerializedName annotations after generation for production use.
What JSON to Java type mappings are used?
String values map to String, integers to int, decimals to double, booleans to boolean, arrays to List<T>, and nested objects to inner classes.
Is my JSON safe when using this tool?
Yes. JSON parsing and class generation happen entirely in your browser. No data is sent to any external server.
