JSON to Java Converter
ConvertersGenerate Java POJO classes from a JSON object instantly in your browser. Powered by quicktype-core. clang-format output. UML class diagram view. Client-side.
JSON →
Java
JSONjson
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Javajava
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Input: 315 chars
About JSON to Java Converter
The JSON to Java converter uses `quicktype-core` with `just-types: true` to generate Java POJO class definitions (no Converter helper, no Jackson annotations on types — plain getters/setters). Post-processing strips boilerplate. Output is formatted with clang-format via WASM. The UML class diagram panel shows the inferred class hierarchy.
Features
- ✓Powered by quicktype-core with just-types mode
- ✓Generates Java POJOs with private fields and public getters/setters
- ✓Post-processed to remove Converter boilerplate
- ✓Formatted with clang-format via WASM for idiomatic Java style
- ✓UML class diagram view shows the inferred class hierarchy
- ✓Handles nested objects → nested Java classes
- ✓Handles arrays → List<T> fields
- ✓Nullable fields annotated clearly
- ✓Download generated Java as a .java file
- ✓Copy output to clipboard in one click
- ✓Web Worker processing — never blocks the UI
- ✓100% client-side — data never leaves your browser
Common Use Cases
- Generating Java POJOs from JSON API responses for Spring Boot apps
- Creating Java model classes from JSON payloads for JAX-RS services
- Scaffolding Java data objects from JSON configuration files
- Reverse-engineering JSON to Java types for Jackson or Gson serialization
Frequently Asked Questions
QDoes it include Jackson annotations?
The output generates plain POJOs. You can add @JsonProperty annotations manually where field names differ from JSON keys.
QIs my data sent to a server?
No. quicktype-core and clang-format WASM run in a Web Worker inside your browser.