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GeekFormat

JSON to Java

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Features

  • Smart code generation: automatically derives field names and types (Integer, Double, Boolean, List) from JSON
  • Annotation support: optional Lombok annotations (@Data) and JPA/Hibernate ORM mapping annotations
  • Nested class handling: automatically generates multi-level nested classes recursively with generic collection support
  • Project integration: supports custom package names and root class names, ready for Spring Data JPA
  • Batch export: supports downloading a single class or packaging all generated class files as ZIP

FAQ

Do the generated Java classes support Lombok annotations?

Absolutely. In the generation options, you can enable Lombok support and the tool will automatically generate code with @Data, @AllArgsConstructor, @NoArgsConstructor and other annotations, significantly reducing boilerplate code and making your entity classes much cleaner.

Can it correctly generate classes for complex JSON with multiple nesting levels?

Yes. The tool includes a recursive parsing engine that deeply analyzes JSON structure. When it encounters nested objects, it automatically generates corresponding inner or separate classes, and handles generic collection types like List<T> and Map<K, V>, ensuring the generated code compiles directly.

How can I use the generated code directly with Spring Data JPA or Hibernate?

In the generation options, you can enable JPA/Hibernate support. The tool will automatically add @Column, @Table, @Id and other annotations to fields, and derive appropriate database types from JSON data types, accelerating ORM mapping configuration.