/tools/json-to-java
JSON to Java Converter
Generate one compilable Java 17 root file containing nested records or POJO classes.
JSON sample
Java output
Ready. Paste representative JSON to infer Java types locally.
/usage
Generate Java records or POJOs from JSON
- Paste representative JSON or choose a local file.
- Select records or classes and Jackson-ready or framework-neutral output.
- Generate one root file, review uncertain types, then copy or download it.
/output
Serializer-aware Java without shape loss
Compilable root file
Nested declarations live inside one root type, avoiding a spray of partially named files.
Jackson aliases
@JsonProperty preserves JSON keys when safe Java identifiers differ.
Nullable evidence
Missing or null numeric and boolean values use boxed primitives. Arrays become List<T>.
Honest mixed types
Irreducible mixed evidence becomes Object with a visible warning instead of a misleading narrow type.
/faq
JSON to Java questions
Which Java version is targeted?
Java 17 is the default baseline. Select POJO classes where records are not suitable.
Does the converter upload API responses?
No. Parsing, shape inference and Java emission run inside a local browser worker.
What happens with a scalar or array root?
The generator preserves the original root shape through a root deserialisation type and nested item declarations.