JSON to POJO Examples

Real-world examples of JSON structures and their corresponding Java POJO classes. Copy, paste, and adapt for your projects.

Convert Your Own JSON

Simple User Profile

Basic flat JSON object to Java class

JSON Input

{
  "id": 1,
  "name": "John Doe",
  "email": "john@example.com",
  "active": true
}

Java POJO Output

public class User {
    private int id;
    private String name;
    private String email;
    private boolean active;
    
    // Getters and setters
}

Nested Address Object

JSON with nested objects → multiple Java classes

JSON Input

{
  "name": "John Doe",
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  }
}

Java POJO Output

public class User {
    private String name;
    private Address address;
}

public class Address {
    private String street;
    private String city;
    private String zipCode;
}

Array of Users (JSON Array)

Root-level array → List<T> in Java

JSON Input

[
  {"id": 1, "name": "Alice"},
  {"id": 2, "name": "Bob"}
]

Java POJO Output

// Use List<User> when parsing
List<User> users = mapper
  .readValue(json, 
    new TypeReference<List<User>>(){});

public class User {
    private int id;
    private String name;
}

API Response with Metadata

Paginated API response pattern

JSON Input

{
  "data": [
    {"id": 1, "name": "Product A"}
  ],
  "meta": {
    "page": 1,
    "total": 100
  }
}

Java POJO Output

public class ApiResponse<T> {
    private List<T> data;
    private Meta meta;
}

public class Meta {
    private int page;
    private int total;
}

public class Product {
    private int id;
    private String name;
}

Date & Time Fields

ISO-8601 dates → LocalDateTime

JSON Input

{
  "event": "Meeting",
  "startTime": "2025-01-15T09:00:00Z",
  "endTime": "2025-01-15T10:00:00Z"
}

Java POJO Output

public class Event {
    private String event;
    
    @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss'Z'")
    private LocalDateTime startTime;
    
    @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss'Z'")
    private LocalDateTime endTime;
}

Enum Values

Fixed string values → Java Enum

JSON Input

{
  "orderId": "ORD-123",
  "status": "SHIPPED"
}

Java POJO Output

public class Order {
    private String orderId;
    private OrderStatus status;
}

public enum OrderStatus {
    PENDING,
    PROCESSING,
    SHIPPED,
    DELIVERED
}

Jackson Guide

Deep dive into ObjectMapper configuration and advanced features.

Kotlin Examples

Convert JSON to Kotlin data classes with null safety.

Spring Boot Guide

Use POJOs with @RequestBody in REST controllers.

Have Your Own JSON?

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