JTA
Tool Spotlight

JSON to Java Class Converter

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

🔽 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.

JSON to Java Class Converter – Generate POJO from JSON Online

Convert JSON to Java classes instantly. Generate POJOs with getters, setters, Jackson annotations, Lombok support, and proper data types for Spring Boot, Hibernate, and REST APIs.

What Is a JSON to Java Class Converter?

A JSON to Java Class Converter is an online tool that automatically generates Java POJOs (Plain Old Java Objects) from JSON data. Instead of manually creating fields, getters, setters, and annotations, you can paste raw JSON from an API response or configuration file and instantly generate clean, strongly-typed Java model classes. This is especially useful when working with Spring Boot REST APIs, microservices, Hibernate entities, or third-party API integrations.

Strongly Typed Java Models

Automatically map JSON fields to proper Java data types including String, Integer, Boolean, Double, and List<T> for arrays.

Spring Boot & Jackson Ready

Generate classes with @JsonProperty annotations compatible with Jackson for seamless JSON serialization and deserialization.

Lombok Support & Clean Code

Reduce boilerplate using Lombok annotations like @Data, @NoArgsConstructor, and @AllArgsConstructor.

Why Use a JSON to Java Class Converter?

1

Save Hours of Manual Coding

Writing Java POJOs manually for large API responses is repetitive and time-consuming. Instantly generate complete classes in seconds and focus on business logic instead of boilerplate.

2

Reduce Runtime Errors

Incorrect data types or mismatched field names can cause serialization and deserialization issues. Automatic generation ensures your Java model matches the JSON structure precisely.

3

Handle Nested Objects & Arrays

The tool automatically creates nested classes for complex JSON structures and uses List<T> generics for array mapping.

4

Perfect for Enterprise Java Development

Ideal for Spring Boot applications, microservices, REST APIs, Hibernate entities, DTO creation, and third-party API integrations.

When Should You Use JSON to Java Class Converter?

1

Consuming REST API Responses

Convert API responses into Java model classes for controllers, services, and DTO layers.

2

Building Spring Boot Applications

Generate Jackson-compatible POJOs for JSON request and response mapping in Spring Boot projects.

3

Integrating Third-Party APIs

Quickly create Java classes from payment gateways, analytics APIs, or external services returning JSON.

4

Working with Nested JSON Structures

Automatically generate nested classes and generic collections when dealing with complex or deeply structured JSON.

5

Rapid Prototyping & Debugging

Paste sample JSON from Postman, logs, or documentation and instantly generate usable Java classes.

How to Convert JSON to Java Class Online

1

Paste Your JSON Input

Copy JSON data from an API response, file, or Postman and paste it into the editor. 

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

The tool automatically generates a fully structured Java POJO with proper data types and 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 in Your Project

Copy the generated class and paste it into your Spring Boot or Java application. Add Lombok dependency if required.

Pro Tips

  • •Enable Lombok in your project to eliminate manual getters and setters.
  • •Add JPA annotations like @Entity, @Table, and @Id if using the class as a database entity.
  • •Use DTOs for API layers and entities for database mapping.
  • •Supports nested objects and automatically generates separate inner classes.
  • •All conversion happens in your browser — no data is uploaded or stored.

Frequently Asked Questions

Everything you need to know about JSONtoAll tools.

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.

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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.