JSON to Java POJO Converter
Paste a JSON sample to instantly generate matching Java classes with private fields, getters, and setters. Free online developer tool.
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Java POJO
Java class definitions will appear here...
Free JSON to Java POJO Converter
Paste a JSON sample to instantly generate matching Java classes with private fields, getters, and setters — a classic POJO for every object level in your JSON.
How to Use It
Paste any JSON object or array, or click "Load Example." The tool infers a type shape and emits one public class per object level, with camelCase field names, matching getter/setter methods,List<T> for arrays (note the java.util.List import called out in a comment when used), and boxed types like Integer or Boolean instead of primitives for any field that's optional or nullable in your sample.
Example
Given {"name": "Ann", "age": 30, "tags": ["a","b"], "address": {"city": "NYC", "zip": null}}, the tool generates a RootAddress class with private city and zipfields plus getters/setters, and a Root class whose tags field is typedList<String>.
Common Use Cases
- Scaffolding DTOs for a Spring Boot or Jackson-based REST API from a sample payload.
- Generating request/response POJOs quickly instead of writing boilerplate getters/setters by hand.
- Bootstrapping model classes for an Android app that consumes a JSON API.
FAQs
Why do some fields use boxed types like Integer instead of int?
Java's primitive types can't represent null. Any field that's missing from at least one sample or was ever null is generated with its boxed equivalent (Integer,Double, Boolean) so the class can actually represent the absence of a value.
Does this work with Jackson or Gson out of the box?
The generated classes follow standard JavaBean conventions (private fields with public getters and setters), which both Jackson and Gson can bind to by default without extra annotations, as long as field names match your JSON keys.
Is my JSON uploaded anywhere?
No — parsing and class generation happen entirely client-side in your browser. Nothing you paste is sent to a server.