JSON to Java class (POJO)

How to use it

1. Enter json input, root type name and add getters and setters.
2. The result appears straight away and updates as you edit.
3. Copy the result, or copy a link that keeps the same values to share it.

How it is calculated

String, int or long depending on the number size, double, boolean, List<T> and Object, with a static nested class per inner object. A field that can be null or missing uses the boxed type such as Integer or Double, and each field has @JsonProperty with the original key.

Example

Inputs: Root type name = Root, Add getters and setters = yes. Result: Generated code: import com.fasterxml.jackson.annotation.JsonProperty; import java.util.List; public class Root { @JsonProperty("id") private int id; @JsonProperty("name") private String name; @JsonProperty("email") private String email; @JsonProperty("is_active") private boolean isActive; @JsonProperty("balance") private double balance; @JsonProperty("tags") private List<String> tags; @JsonProperty("address") private Address address; @JsonProperty("orders") private List<Order> orders; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } 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 List<String> getTags() { return tags; } public void setTags(List<String> tags) { this.tags = tags; } 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 static class Address { @JsonProperty("city") private String city; @JsonProperty("postal_code") private String postalCode; public String getCity() { return city; } public void setCity(String city) { this.city = city; } public String getPostalCode() { return postalCode; } public void setPostalCode(String postalCode) { this.postalCode = postalCode; } } public static class Order { @JsonProperty("order_id") private String orderId; @JsonProperty("total") private double total; @JsonProperty("coupon") private String coupon; 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 String getCoupon() { return coupon; } public void setCoupon(String coupon) { this.coupon = coupon; } } }; Types generated: 3; Fields: 13.

{
  "id": 1024,
  "name": "Sara Ahmed",
  "email": "sara@example.com",
  "is_active": true,
  "balance": 1520.75,
  "tags": ["vip", "riyadh"],
  "address": { "city": "Riyadh", "postal_code": "12211" },
  "orders": [
    { "order_id": "A-1", "total": 99.5, "coupon": "EID10" },
    { "order_id": "A-2", "total": 120, "coupon": null }
  ]
}

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

public class Root {
    @JsonProperty("id")
    private int id;

    @JsonProperty("name")
    private String name;

    @JsonProperty("email")
    private String email;

    @JsonProperty("is_active")
    private boolean isActive;

    @JsonProperty("balance")
    private double balance;

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

    @JsonProperty("address")
    private Address address;

    @JsonProperty("orders")
    private List<Order> orders;

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    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 List<String> getTags() {
        return tags;
    }

    public void setTags(List<String> tags) {
        this.tags = tags;
    }

    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 static class Address {
        @JsonProperty("city")
        private String city;

        @JsonProperty("postal_code")
        private String postalCode;

        public String getCity() {
            return city;
        }

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

        public String getPostalCode() {
            return postalCode;
        }

        public void setPostalCode(String postalCode) {
            this.postalCode = postalCode;
        }
    }

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

        @JsonProperty("total")
        private double total;

        @JsonProperty("coupon")
        private String coupon;

        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 String getCoupon() {
            return coupon;
        }

        public void setCoupon(String coupon) {
            this.coupon = coupon;
        }
    }
}

Limits and caveats

• Needs the Jackson library (jackson-annotations) in your project.
• A number above 2147483647 in the sample makes the field long; otherwise it stays int.