JSON to Java — Generate Java Classes from JSON Online

What is JSON to Java?

Generate Java classes from JSON. Convert JSON to POJOs or DTOs for your backend or Android app.

Convert JSON to Java class definitions. Paste JSON and get Java fields and types. Use for REST API DTOs, Android models, or backend services. All processing in your browser. Part of formatterjson.org developer tools.

How to Use JSON to Java

1. Paste or type your input into the editor on the left panel.
2. Results update automatically while you type. You can also press Ctrl+Enter to force a refresh.
3. View the result in the output panel on the right with full syntax highlighting.
4. Use Copy or Download to export the result.
5. Drag and drop .json or .txt files directly into the editor.
6. Toggle Tree View for an interactive, collapsible view of the JSON structure.

Example

{"name":"John","age":30}

public class Root {
    private String name;
    private Double age;
}

Common Use Cases

• REST clients
• Android models
• DTOs
• Serialization

Common Errors

• Invalid JSON
• Trailing commas

Why Use Our JSON to Java?

• 100% client-side — your data never leaves your browser. No server processing, no data collection.
• No sign-up required — start using the tool instantly with no registration or installation.
• Keyboard shortcuts — press Ctrl+Enter to run, ? for shortcuts list, Ctrl+B to toggle sidebar.
• Persistent state — your input is automatically saved across sessions using local storage.
• IDE-style interface — Monaco Editor (the engine behind VS Code) with syntax highlighting and error detection.
• Multi-format conversion — convert between JSON, XML, CSV, and YAML without switching tools.

Frequently Asked Questions

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