JSON to Java – Generate POJO Classes from JSON

Stop writing boilerplate Java classes by hand. Our tool analyzes any JSON structure and generates ready‑to‑use Java POJOs with fields, constructors, getters, setters, and optional annotations for popular libraries like Gson and Jackson.

How It Works

You provide a JSON sample (e.g., API response). The tool infers data types for each field, detects nested objects and arrays, and produces Java classes. You can choose the library, naming style, and additional features like Lombok or records.

Example JSON Input

{
  "id": 1,
  "name": "John Doe",
  "active": true,
  "address": {
    "street": "123 Main St",
    "city": "Boston"
  },
  "tags": ["user", "premium"]
}

Generated Java Code (Gson, with Lombok)

import lombok.Data;
import com.google.gson.annotations.SerializedName;
import java.util.List;

@Data
public class User {
    private int id;
    private String name;
    private boolean active;
    private Address address;
    private List<String> tags;

    @Data
    public static class Address {
        private String street;
        private String city;
    }
}

Supported Output Styles

• Plain POJO – fields + getters/setters
• Lombok – @Data, @Builder, @AllArgsConstructor
• Java Records (immutable)
• Jackson – @JsonProperty, @JsonIgnoreProperties(ignoreUnknown = true)
• Gson – @SerializedName
• org.json – parsing code instead of POJO

Use Cases

• Consuming REST APIs in Android or Spring Boot
• Creating data models from JSON schemas
• Migrating from JSON‑based config to Java code
• Teaching Java beginners how JSON maps to objects

Our generator handles arrays, nested objects, mixed‑type arrays, and even optional fields. You can customize the class name, package, and indentation. No registration, no watermarks – just instant Java code.