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JSON → Java Class

Paste or fetch JSON data and generate clean, type-safe Java classes instantly.

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🔽 JSON Input

JSON

☕ Java Class

JAVA

Instant Conversion

Convert your data in real-time as you type. No delays, no waiting.

100% Private

All processing happens in your browser. Your data never leaves your device.

Always Free

No hidden fees, no premium plans. All features are completely free forever.

What is JSON to Java Class Converter?

Our free online JSON to Java class converter helps Java developers automatically generate Plain Old Java Objects (POJOs) from JSON data. Whether you're working with Spring Boot REST APIs, Hibernate entities, or microservices, this tool saves you hours of manual coding and reduces errors.

Type Safety

Generate strongly-typed Java classes with proper data types that catch errors at compile time.

Framework Ready

Includes Jackson and Lombok annotations for seamless Spring Boot and Hibernate integration.

Best Practices

Automatically follows Java naming conventions with proper encapsulation and Lombok annotations.

Why Use JSON to Java Class Converter?

1

Save Development Time

Manually writing Java POJOs from API responses is tedious and time-consuming. Our tool generates complete classes with getters, setters, and annotations automatically in seconds, letting you focus on business logic instead of boilerplate code.

2

Reduce Errors

Typos in field names or incorrect data types can cause runtime errors that are hard to debug. Automated generation ensures your Java classes match your JSON structure perfectly, catching bugs before they reach production.

3

Handle Complex Structures

Working with deeply nested objects or large API responses? Our tool handles complex JSON structures with ease, generating properly nested classes and detecting array types automatically with proper List<T> generics.

4

Perfect for Spring Boot

When building REST APIs with Spring Boot, you need POJOs with Jackson annotations for JSON serialization. Paste the API response into our tool and get ready-to-use Java classes with @JsonProperty annotations for your controllers and services.

How to Use the JSON to Java Class Converter

1

Paste Your JSON

Copy your JSON data from an API response, Postman, file, or any other source and paste it into the left editor panel. 

{
  "name": "John Doe",
  "email": "john.doe@example.com",
  "age": 30,
  "active": true
}
2

The tool automatically generates a Java POJO in the right panel. It detects types, handles nested objects, and creates proper class structure with Lombok annotations.

The tool automatically generates a TypeScript interface in the right panel. It detects types, handles nested objects, and creates proper interface names. 

import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.AllArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    @JsonProperty("name")
    private String name;
    
    @JsonProperty("email")
    private String email;
    
    @JsonProperty("age")
    private Integer age;
    
    @JsonProperty("active")
    private Boolean active;
}
3

Copy & Use

Click the 'Copy' button to copy the generated Java class to your clipboard, then paste it directly into your Spring Boot or Java project. No manual editing needed—it's ready to use!

Pro Tips

  • •Use the "Fetch JSON" feature to directly load data from an API endpoint
  • •Upload JSON files from your computer using the file upload option
  • •The tool preserves nested structures and automatically creates separate classes
  • •Add Lombok dependency to your project to use @Data, @NoArgsConstructor, @AllArgsConstructor
  • •For JPA entities, add @Entity, @Table, and @Id annotations after generation
  • •Works with Jackson for JSON serialization in Spring Boot REST APIs

Frequently Asked Questions

What is a JSON to Java Class Converter?
A JSON to Java Class Converter transforms a JSON structure into Java POJO (Plain Old Java Object) classes with proper fields, data types, and getters/setters.
Why do developers convert JSON to Java classes?
Developers convert JSON to Java classes to simplify data handling, enable type safety, reduce runtime errors, and integrate JSON data seamlessly with Java applications.
What is a POJO in Java?
A POJO (Plain Old Java Object) is a simple Java class containing private fields with public getters and setters, without any framework-specific dependencies.
Does the JSON to Java Class tool support nested JSON?
Yes. The tool fully supports nested objects, arrays, and deeply structured JSON, generating corresponding nested Java classes.
Are arrays in JSON converted properly?
Yes. JSON arrays are converted into Java Lists or arrays with the correct generic types based on the JSON structure.
Does the tool generate getters and setters?
Yes. The generated Java classes include standard getters and setters following Java naming conventions.
Can it generate classes compatible with Jackson or Gson?
Yes. The generated Java classes are compatible with popular libraries like Jackson and Gson for JSON serialization and deserialization.
Does the converter handle null values?
Yes. Fields that can be null in JSON are generated using nullable Java reference types to ensure safe parsing.
Can I customize the Java class name?
Yes. You can specify a custom root class name before generating the Java class.
Does it generate multiple classes for complex JSON?
Yes. For complex or nested JSON, the tool generates multiple related Java classes automatically.
Is the generated code production-ready?
Yes. The generated Java code follows clean coding practices and is ready for use in real-world applications.
Does the tool validate JSON before conversion?
Yes. The tool validates the JSON input and reports errors before generating Java classes.
Can I use the generated classes in Spring Boot?
Absolutely. The generated Java classes work perfectly with Spring Boot controllers, services, and REST APIs.
Does it support primitive and complex data types?
Yes. Numbers, strings, booleans, objects, arrays, and null values are mapped to appropriate Java types.
Can large JSON files be converted to Java classes?
Yes. The tool efficiently handles large and deeply nested JSON files.
Is the JSON to Java Class converter free to use?
Yes. The tool is completely free and can be used without login or signup.
Can I download or copy the generated Java code?
Yes. You can easily copy the generated Java classes or download them as .java files.
Does the tool follow Java naming conventions?
Yes. Class names, fields, and methods follow standard Java naming conventions for readability and consistency.
Is this tool useful for API development?
Yes. It is especially useful for building REST APIs, handling request/response bodies, and working with third-party APIs.
Can I integrate JSON to Java Class conversion into my workflow?
Yes. You can use the online tool or integrate similar logic into your backend or build pipeline.
Who should use JSON to Java Class conversion?
Java developers, backend engineers, API developers, and anyone working with JSON-based data in Java applications will benefit from this tool.
Is this tool really free?
Yes! JSONToAll is completely free to use with no hidden fees, registration requirements, or usage limits. All processing happens in your browser, so we don't even store your data.
Is my data safe and private?
Absolutely! All conversion happens entirely in your browser using JavaScript. Your data never leaves your device or gets sent to our servers. You can even use this tool offline once the page loads.
Do I need to install anything?
No installation required! This is a browser-based tool that works instantly. Just visit the page, use the tool, and you're done. No downloads, no setup, no configuration needed.
Can I use this for large files?
Yes! The tool can handle large and complex data structures. However, extremely large files (10MB+) might slow down your browser since all processing happens client-side. For best performance, use files under 5MB.

Ready to Generate Java Classes Instantly?

Stop writing Java POJOs manually. Convert JSON into clean, type-safe Java classes with getters and setters in seconds. Free, fast, and 100% browser-based.