JSON to Java POJO Generator

Convert JSON payloads to Java POJOs with typed fields, getters, and setters — handles nested objects and arrays

Root class:

Input

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Output

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What is JSON to Java POJO Generator

Last reviewed: April 18, 2026

JSON (JavaScript Object Notation) is a lightweight, human-readable data format used almost everywhere on the web for APIs, config files, and log output.

JSON to Java POJO Generator infers field types from your JSON payload and emits a set of Java classes with private fields, getters, setters, and `List<T>` wrappers for arrays.

It's the fastest way to scaffold Java DTOs for new APIs — paste a sample response, pick a root class name, and get classes ready to drop into your service.

Why use it

Scaffold Java DTOs for new APIs.
Port TypeScript models to Java.
Teach Java bean conventions.
Accelerate test-fixture creation.
Prototype services with realistic types.

Features

Typed fields & getters / setters
List<T> for JSON arrays
Nested class generation
Root class name configurable
Client-side JSON to Java POJO Generator workflow, no servers involved

How to use JSON to Java POJO Generator

Paste JSON. Drop any object or array-of-objects JSON.
Set root class. Use the toolbar input.
Run. Copy the generated classes.

Example (before/after)

JSON

{ "id": 1, "name": "Ada", "tags": ["admin"] }

Java

import java.util.List;

public class User {
    private Integer id;
    private String name;
    private List<String> tags;

    public Integer getId() { return id; }
    public void setId(Integer id) { this.id = id; }
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
    public List<String> getTags() { return tags; }
    public void setTags(List<String> tags) { this.tags = tags; }
}

Common errors

Mixed-type arrays

Arrays with mixed element types infer from the first element.

Fix: Normalise arrays or tweak types manually.

Null values

Null fields infer as Object.

Fix: Fill in defaults in sample JSON or adjust types.

FAQ

Does it generate Lombok annotations?

No — plain POJOs. Add @Data / @Builder manually if desired.

Does it generate Jackson annotations?

Not by default — plain beans only.

Are nested objects generated as classes?

Yes — each nested object becomes its own class.

Are dates typed?

Dates in JSON are strings and stay String — adjust manually.

Is input uploaded?

No — Java POJOs are emitted locally in your browser from the pasted JSON.

Related tools

Pair with other POJO generators and JSON tools. You can also browse the full POJO & Schema Generators category for more options.

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