JSON to Java Class

Generate Java POJO classes from JSON, in your browser.

Class name:

JSON

Java Class

public class User {
    private String name;
    private int age;
    private List<String> skills;
    private Address address;

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
    public int getAge() { return age; }
    public void setAge(int age) { this.age = age; }
    public List<String> getSkills() { return skills; }
    public void setSkills(List<String> skills) { this.skills = skills; }
    public Address getAddress() { return address; }
    public void setAddress(Address address) { this.address = address; }
}

public class Address {
    private String city;
    private String zip;

    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; }
}

Processed in your browser

What it's for

JSON to production-ready Java POJO

Compatible with Jackson and Gson

Generated classes work directly with the most popular Java JSON serialization libraries without additional configuration.

100% private

Your JSON is processed in the browser. Never sent to servers. Safe for confidential API data or business structures.

Clean, conventional code

Getters, setters, and constructors generated following JavaBeans conventions. Code ready for review and production.

Instant

Code generation happens in milliseconds. No waiting, no servers, no signup.

How it works

Three steps, no hassle

Paste your JSON

Paste any valid JSON object. The parser detects types, nested fields, and arrays automatically.

Generate the Java class

A POJO class is generated with private fields, getters, setters, and constructors. Nested objects become inner classes.

Copy and use in your project

Copy the generated code directly to your IDE. Compatible with Jackson, Gson, and Spring Boot without modifications.

FAQ

Got questions?

What is a POJO in Java?

POJO stands for Plain Old Java Object. It's an ordinary Java class with no special framework dependencies. POJOs are the standard way to represent data in Java: they have private fields with public getters and setters, and optionally an all-arguments constructor. Frameworks like Jackson and Gson use the getters and setters to automatically serialize and deserialize JSON.

Are getters and setters generated automatically?

Yes. For each field, a getter (getFieldName()) and a setter (setFieldName(value)) are generated following JavaBeans conventions. A no-argument constructor (required by many deserialization frameworks) and an all-arguments constructor are also generated for easy instantiation.

How are nested objects handled?

Nested JSON objects are converted to static inner classes inside the main class. For example, if your JSON has an 'address' field that is an object, an inner Address class will be generated with its own fields and methods. This keeps the code organized in a single file.

What naming conventions are used?

Field names follow camelCase (fieldName), which is the standard Java convention. Class names follow PascalCase (ClassName). If your JSON has keys with hyphens or underscores (field-name, field_name), they are automatically converted to camelCase in Java.

Are JSON arrays converted to List or ArrayList?

JSON arrays are converted to List<Type> using the List interface, which is the recommended Java practice (program to interfaces, not implementations). The java.util.List import is included automatically. If you prefer ArrayList, you can easily change the type in your IDE.