JSON to Java

Generate Java classes or records from JSON. Free, private, runs in your browser.

100% private — your files and text never leave your browser. All processing happens locally on your device.

Input JSON

Generator Settings

Root classPackage

Shape

Annotations

Paste JSON above to generate code.

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Generate Java Models From JSON

JSON to Java turns sample JSON into classes or records with nested types, List<T> arrays, sanitized identifiers, package validation, and optional Jackson or Gson annotations.

Single Listing Output

Phase 4 emits all generated Java types in one source listing rather than packaging multiple files. Split them into separate files if your build expects one public type per file.

Local Inference Caveats

Reserved words and invalid keys are adjusted locally, but sample-based inference cannot know every production variant. Review Object fallbacks and list element types before using the models.

FAQ

Can it generate Java records?

Yes. Choose classes or records depending on your project style and Java version.

Which annotations are available?

You can emit Jackson @JsonProperty, Gson @SerializedName, or no annotations.

How are invalid identifiers handled?

Field and class names are converted into Java-safe identifiers and reserved words are suffixed.

Does it create a ZIP of classes?

No. Phase 4 emits one source listing with all generated types so you can split it as needed.

Is my JSON uploaded?

No. The conversion is local and private.