Is my JSON data uploaded to a server?

No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

Why records instead of classic classes?

Records (available since Java 16) are concise, immutable data carriers, ideal for mapping JSON payloads. One record is generated per nested object.

Which Java types are used?

Boxed types such as Long, Double and Boolean are used, arrays become List , and field names are converted to camelCase.

JSON to Java Record Converter

JSON to Java Record Converter — Free Online Tool

Convert JSON to Java records (Java 16+) instantly in your browser. Free, private and offline-friendly: your data never leaves your device.

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Root name

JSON input

Java output

Why convert JSON to Java?

Mapping JSON payloads to Java data classes by hand is tedious. Paste a sample JSON document above and get ready-to-use Java records in milliseconds, with one record per nested object.

How it works

The converter parses your JSON locally and generates Java records (Java 16+). Numbers map to boxed Long or Double, booleans to Boolean, arrays to List<T>, and every field name is converted to camelCase. Each nested object becomes its own record referenced from the parent.

Frequently asked questions

Is my JSON data uploaded to a server?: No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
Why records instead of classic classes?: Records (available since Java 16) are concise, immutable data carriers, ideal for mapping JSON payloads. One record is generated per nested object.
Which Java types are used?: Boxed types such as Long, Double and Boolean are used, arrays become List<T>, and field names are converted to camelCase.