JSON to Java POJO Classes Generator Online Free

Input

{
  "id": 9001,
  "username": "devtoolpad",
  "active": true,
  "profile": {
    "displayName": "Dev Tool Pad",
    "timezone": "Asia/Kolkata"
  },
  "roles": ["admin", "editor"],
  "sessions": [
    {
      "token": "abc123",
      "expiresAt": "2026-12-01T10:00:00Z"
    },
    {
      "token": "xyz444"
    }
  ]
}

Input chars: 317Input lines: 19POJO class generation

Output

import java.util.ArrayList;

public class Rootobject {

    private double id;
    private String username;
    private boolean active;
    private Profile profile;
    private ArrayList<String> roles;
    private ArrayList<Sessionsitem> sessions;

    public double getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public boolean getActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }

    public Profile getProfile() {
        return profile;
    }

    public void setProfile(Profile profile) {
        this.profile = profile;
    }

    public ArrayList<String> getRoles() {
        return roles;
    }

    public void setRoles(ArrayList<String> roles) {
        this.roles = roles;
    }

    public ArrayList<Sessionsitem> getSessions() {
        return sessions;
    }

    public void setSessions(ArrayList<Sessionsitem> sessions) {
        this.sessions = sessions;
    }

}

public class Sessionsitem {

    private String token;
    private String expiresat;

    public String getToken() {
        return token;
    }

    public void setToken(String token) {
        this.token = token;
    }

    public String getExpiresat() {
        return expiresat;
    }

    public void setExpiresat(String expiresat) {
        this.expiresat = expiresat;
    }

}

public class Profile {

    private String displayname;
    private String timezone;

    public String getDisplayname() {
        return displayname;
    }

    public void setDisplayname(String displayname) {
        this.displayname = displayname;
    }

    public String getTimezone() {
        return timezone;
    }

    public void setTimezone(String timezone) {
        this.timezone = timezone;
    }

}

Output chars: 1963Output lines: 107ArrayList and nested classes ready

About This Tool

JSON to Java Classes Generator converts any JSON payload into well-structured Java POJO classes instantly, right in your browser for free. When working with REST APIs, backend services, or data migration pipelines, manually writing Java model classes from JSON responses takes time and introduces typo risks. This tool infers class names from JSON key paths, handles deeply nested objects by generating inner classes, converts JSON arrays to ArrayList with properly typed generics, and scaffolds standard getter and setter methods for every field.

How to Generate Java Classes from JSON

Paste your JSON payload into the input editor.
Review the generated Java POJO classes on the right.
Copy the output or download it as a .java text file.
Rename root class names to match your domain model.
Add JPA, Jackson, or Lombok annotations as needed.

Features

Generates nested inner classes from nested JSON objects.
Converts JSON arrays to List<T> with inferred element types.
PascalCase class names and camelCase field names following Java conventions.
Includes public getter and setter methods for every field.

Common Use Cases

Model REST API responses in Spring Boot or Jersey
Scaffold Android Retrofit data models
Create entity classes for JPA/Hibernate from JSON schemas
Prototype data models before writing full Java code
Map third-party API payloads to Java objects quickly

Frequently Asked Questions

How do I convert JSON to Java POJO class online for free?

Paste your JSON payload into the input editor. The tool instantly generates Java POJO class code with fields, getters, and setters on the right. Copy or download the output for free without any sign-up.

Does the generator create nested Java classes for nested JSON?

Yes. Nested JSON objects are converted to inner static classes inside the parent POJO, preserving the object hierarchy.

How are JSON arrays handled?

JSON arrays become `List<T>` fields with an inferred generic type. If the array contains objects, a corresponding inner class is generated for the element type.

Does the output include getters and setters?

Yes. Every field includes a public getter and setter method following Java naming conventions.

Can I use this for Android development or Spring Boot?

Yes. The generated POJOs are compatible with Android Retrofit/Gson and Spring Boot Jackson deserialization. You may add @JsonProperty or @SerializedName annotations after generation for production use.

What JSON to Java type mappings are used?

String values map to String, integers to int, decimals to double, booleans to boolean, arrays to List<T>, and nested objects to inner classes.

Is my JSON safe when using this tool?

Yes. JSON parsing and class generation happen entirely in your browser. No data is sent to any external server.