A POJO is a Plain Old Java Object: an ordinary Java class with fields and getters and setters, used to hold data such as the body of an API response.

How do I convert JSON to a Java class online?

Paste your JSON into the left editor, set the root class name, choose your options and press Convert. The Java classes appear on the right, ready to copy into your project.

Does it create classes for nested objects?

Yes. Each nested JSON object becomes its own class, and arrays become lists of that type.

Which field types does it generate?

It infers String, int, double, boolean and List from your values. Check numbers that could be larger than an int, such as IDs, and change them to long if needed.

Can it add Lombok and Jackson annotations?

Yes. Switch on Lombok to replace getters and setters with annotations, and Jackson to add JSON mapping annotations. Both are on by default.

What about JSON keys that are not valid Java names?

Review the generated field names. Keys with dashes or spaces need a Java-friendly name plus a Jackson annotation that maps back to the original key.

Is my JSON sent anywhere?

No. The conversion runs in your browser, so your data stays private.

Is the converter free?

Yes. It is free with no sign-up.

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JSON to POJO Converter

Generate Plain Old Java Objects (POJOs) from your JSON data structure instantly.

Settings

Root Class Name

Use Lombok Annotations

Use Jackson Annotations

About the JSON to POJO Tool

For Java developers working with APIs and data serialization, manually creating Plain Old Java Objects (POJOs) to match a JSON structure can be tedious and error-prone. This tool automates the process entirely. Paste your JSON object into the editor, and it will instantly generate the corresponding Java class structure, including nested classes for complex objects. It intelligently infers data types (String, int, double, boolean, List) and can optionally add helpful annotations for libraries like Lombok (for boilerplate code reduction) and Jackson (for JSON mapping), saving you significant development time.

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