JSONToTable

JSON to POJO Converter

Convert JSON data to Java Plain Old Java Objects (POJOs)

JSON Input

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Java POJO Output

Java POJO code will appear here

Paste JSON in the input area to get started

How to Convert JSON to POJO Classes - Complete Guide

Step 1

Input Your JSON Data

Start by adding your JSON data that needs to be converted to Java POJO classes. The tool analyzes the structure to generate clean POJOs.

Example: Try This JSON Data

Copy and paste this JSON example to see how it works: ☕

{
  "user": {
    "id": 12345,
    "firstName": "Maria",
    "lastName": "Garcia",
    "email": "maria.garcia@telecommax.com",
    "age": 30,
    "active": true,
    "roles": [
      "USER",
      "ADMIN"
    ],
    "address": {
      "street": "123 Main Street",
      "city": "New York",
      "state": "NY",
      "zipCode": "10001"
    }
  }
}
Step 2

Configure POJO Options

Customize how your JSON is converted to Java POJO classes! ⚙️ Choose annotations and code style preferences.

•
Jackson annotations: Generate @JsonProperty annotations for JSON binding
•
Clean POJO structure: Generate Plain Old Java Objects with proper encapsulation
•
Getters and setters: Auto-generate accessor methods following JavaBean conventions
•
Constructors: Generate default and parameterized constructors
•
Nested classes: Handle complex JSON hierarchies with inner POJO classes
Step 3

Get Generated POJO Code

Watch the transformation! ✨ Your JSON structure becomes clean, well-structured Java POJO classes.

POJO Code Output

Your JSON becomes these Java POJO classes:

import com.fasterxml.jackson.annotation.JsonProperty;
import java.util.List;

public class User {
    @JsonProperty("id")
    private Integer id;

    @JsonProperty("firstName")
    private String firstName;

    @JsonProperty("lastName")
    private String lastName;

    @JsonProperty("email")
    private String email;

    @JsonProperty("age")
    private Integer age;

    @JsonProperty("active")
    private Boolean active;

    @JsonProperty("roles")
    private List<String> roles;

    @JsonProperty("address")
    private Address address;

    // Default constructor
    public User() {
    }

    // Getters and setters...
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    // ... other getters and setters
}
Step 4

Copy or Download POJO Code

Perfect! Now you can use your Java POJO classes in your applications for JSON processing. 🚀

•
Copy to clipboard for immediate use in your Java projects
•
Download .java files for integration into your codebase
•
Use with frameworks like Spring Boot, Hibernate, and JAX-RS
•
Enterprise applications and REST APIs

What is JSON to POJO Conversion? 🔄

JSON to POJO conversion transforms JSON data structures into Plain Old Java Objects (POJOs) - simple Java classes that follow JavaBean conventions. POJOs are clean, framework-independent classes with private fields, public getters/setters, and constructors, making them perfect for data modeling and JSON serialization/deserialization.

The generated POJO classes include Jackson annotations for seamless JSON binding, proper encapsulation with private fields, and all necessary accessor methods. This approach ensures your Java code remains clean, maintainable, and follows industry best practices.

Frequently Asked Questions

What is a POJO and how is it different from regular Java classes?

A POJO (Plain Old Java Object) is a simple Java class that follows JavaBean conventions with private fields, public getters/setters, and no framework dependencies. Unlike regular classes, POJOs are designed for data modeling and can be easily serialized/deserialized with JSON libraries like Jackson.

Does the POJO generator include Jackson annotations?

Yes! The generated POJO classes include proper Jackson annotations like @JsonProperty for field mapping, enabling seamless JSON serialization and deserialization in Spring Boot applications and other Java frameworks.

How are nested JSON objects handled in POJO generation?

Nested JSON objects are automatically converted into separate POJO classes with proper relationships. The generator creates inner classes or separate class files for complex hierarchies, maintaining clean code structure and type safety.

Can I use generated POJOs with Spring Boot and Hibernate?

Absolutely! The generated POJOs are framework-independent and work perfectly with Spring Boot for REST APIs, Hibernate for database mapping, and other Java frameworks. They follow standard JavaBean conventions for maximum compatibility.

What Java data types are used for different JSON values?

The generator intelligently maps JSON types to appropriate Java types: strings to String, numbers to Integer/Double, booleans to Boolean, arrays to List<T>, and objects to custom POJO classes. This ensures type safety and proper data handling.

Is the JSON to POJO converter free to use?

Yes, completely free with no limitations on JSON complexity, file size, or conversion frequency. No registration required, and you can generate unlimited POJO classes from JSON data with full Jackson annotation support.