JSON to DTO Generator

Guide: Turn JSON or XML Into Classes (DTOs) in Java, C# and More

JSON input

{
  "id": 101,
  "user_name": "ann",
  "email": "ann@example.com",
  "is_active": true,
  "balance": 1520.75,
  "address": { "street": "1 Main St", "city": "Austin", "zip": "73301" },
  "orders": [
    { "order_id": "A-1", "total": 29.9, "items": ["pen", "book"] },
    { "order_id": "A-2", "total": 5, "items": [], "gift": true }
  ]
}

{
  "id": 101,
  "user_name": "ann",
  "email": "ann@example.com",
  "is_active": true,
  "balance": 1520.75,
  "address": { "street": "1 Main St", "city": "Austin", "zip": "73301" },
  "orders": [
    { "order_id": "A-1", "total": 29.9, "items": ["pen", "book"] },
    { "order_id": "A-2", "total": 5, "items": [], "gift": true }
  ]
}

Language

Root class name

Java style

Package (optional)

Add Jackson @JsonProperty annotations

Generated Java code3 classes

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

// Each class below belongs in its own file, named after the class (for example Root.java).

public class Root {
    private Integer id;

    @JsonProperty("user_name")
    private String userName;

    private String email;

    @JsonProperty("is_active")
    private Boolean isActive;

    private Double balance;

    private Address address;

    private List<Order> orders;

    public Integer getId() {
        return id;
    }

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

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Boolean getIsActive() {
        return isActive;
    }

    public void setIsActive(Boolean isActive) {
        this.isActive = isActive;
    }

    public Double getBalance() {
        return balance;
    }

    public void setBalance(Double balance) {
        this.balance = balance;
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public List<Order> getOrders() {
        return orders;
    }

    public void setOrders(List<Order> orders) {
        this.orders = orders;
    }
}

public class Address {
    private String street;

    private String city;

    private String zip;

    public String getStreet() {
        return street;
    }

    public void setStreet(String street) {
        this.street = street;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getZip() {
        return zip;
    }

    public void setZip(String zip) {
        this.zip = zip;
    }
}

public class Order {
    @JsonProperty("order_id")
    private String orderId;

    private Double total;

    private List<String> items;

    private Boolean gift;

    public String getOrderId() {
        return orderId;
    }

    public void setOrderId(String orderId) {
        this.orderId = orderId;
    }

    public Double getTotal() {
        return total;
    }

    public void setTotal(Double total) {
        this.total = total;
    }

    public List<String> getItems() {
        return items;
    }

    public void setItems(List<String> items) {
        this.items = items;
    }

    public Boolean getGift() {
        return gift;
    }

    public void setGift(Boolean gift) {
        this.gift = gift;
    }
}

Nothing you enter or choose here leaves your device. This tool runs in your browser.

How to use

1Paste a JSON object, or a list of objects, into the input box.
2Choose the language and, if you like, a root class name and package.
3Pick a style and turn annotations on or off.
4Click Copy code and paste it into your project.

Frequently asked questions

What is a DTO?

A data transfer object is a simple class that holds the fields of a request or response, such as an API result, so you can use it as typed data in your code.

How are types and nested objects handled?

Every nested object becomes its own class, lists become List or array types, and numbers become int, long or double depending on the values. Fields that are missing from some objects in a list are marked optional, and fields that are null become nullable.

Why does 10.0 become an integer?

JSON doesn't tell integers and decimals apart, and 10.0 is read as the number 10. If a field can be fractional, include a value like 10.5 in your sample, or change the type by hand.

Is my JSON uploaded anywhere?

No. The classes are generated in your browser, so private API responses stay on your device.

Read the guide

Learn how this works and how to get the most from it.

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