JSON → Java POJO

Generate Java POJO classes from JSON with Lombok support.

JSON InputRoot Name:
0 chars
Output
Lines: -Size: -
Converting via Web Worker…
🛡️️Zero server logs. Conversion runs 100% inside your browser.
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JSON → Java POJO

Generate clean Java POJO classes from JSON with proper type mapping and nested inner classes. 100% client-side.

🔒 Client-side only⚡ Web Worker processing🌐 Works offline🛡️ Zero server logs

How to Use

  1. Paste your JSON data into the input editor.
  2. Optionally change the root class name and click Convert.
  3. Copy the generated Java class with inner static classes for nested objects.

Frequently Asked Questions

Questions about this tool? We have got answers.

How are nested objects handled?

Nested JSON objects become public static inner classes within the root class. This keeps related types together.

What type mapping is used?

Integers map to Integer, decimals to Double, strings to String, booleans to Boolean, arrays to List. Number types distinguish int vs double.

Is my data sent to a server?

No. All conversion runs 100% client-side via a Web Worker.

Tool Changelog & Updates

v1.1.02026-06-12
  • Fix: Nested objects now generate as public static inner classes. Number types correctly distinguish int vs double.
  • Feature: Accurate number type mapping — integer values map to the language's native integer type, decimal values map to float/double.
  • UX: Updated module descriptions, How-to guides, and FAQ sections with multi-language support.
  • Fix: Fixed "Conversion complete" toast showing even when JSON parsing failed — now only shows success on actual completion, shows error message on failure.
1.0.02026-06-09
  • Feature: Initial release