Inference rulesNested objects split into separate types; arrays are typed automatically; optional/nullable fields detected; mixed types form unions; null / empty arrays fall back to sane types; identical shapes are deduped and name clashes disambiguated.Max input size: TBD (placeholder)

Sample JSONJSON

Paste or type JSON

GeneratedJava

Paste or type JSON

JSON → record · Local · No upload

JSON to Java POJO Generator

Sample JSON → POJO / record · Jackson annotations · Nested types

🔒Processed locally in your browser — never uploaded or stored

No upload, no storage

JSON is processed in memory and never sent to a server.

Share via URL fragment

Share links encode data in the # anchor — never sent to a server.

Remember last edit

Optionally keep your last input locally; clear it with one click.

Generate POJO Classes｜Lombok·Jackson·Gson｜Java Records｜Runs Locally

Generate record / POJO

Concise Java records; nested objects split into types.

Jackson Annotations

Adds @JsonProperty when a field name differs from JSON.

Boxed Nullable Types

Long/Double/Boolean express nullable values.

Compiles As-Is

Idiomatic Java output — paste in and build.

Runs Locally — No Upload

Generation runs in your browser; data is never uploaded.