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JSON à POJO Converter
Convert JSON données à Java POJOs avec customizable options
How to convert JSON to POJO online?
Convert JSON data to Java POJOs with our professional code generator. Generate classes with proper annotations, getters, setters, and validation. Perfect for API development, data modeling, and Java application integration with enterprise-grade features.
Conseils et bonnes pratiques
- Paste a representative sample of your JSON — the converter infers field types from the first non-null value it sees per key.
- Nullable fields are marked with optional wrappers (Java Optional, Kotlin ?, TypeScript ?) where the language supports it.
- For nested objects, the converter emits a class per nested shape so you don't end up with one mega-class.
- Arrays use the element type from the first item; mixed-type arrays default to the language's top type.
- Everything runs in your browser; pasted JSON never leaves your machine.
FAQ
What is a POJO?
POJO stands for Plain Old Java Object. It's a Java object that doesn't extend or implement any special classes or interfaces, making it simple and portable.
What Java versions are supported?
The converter supports Java 8, 11, 17, and 21 with appropriate syntax and features for each version.
Can I customize the generated code?
Yes, you can configure package names, class names, annotations (Lombok, Jackson, Bean Validation), and various generation options to match your project requirements.
What frameworks are supported?
The tool supports Spring Boot, Jakarta EE, and plain Java projects with appropriate annotations and imports for each framework.
How does JSON to POJO conversion work?
The tool analyzes your JSON structure, infers data types, generates corresponding Java classes with proper annotations, getters, setters, and utility methods.
Can I handle complex nested JSON structures?
Yes, the tool automatically creates nested classes for complex objects and handles arrays, null values, and various data types including dates and numbers.
What annotations are available?
The tool supports Jackson annotations for JSON serialization, Bean Validation annotations for data validation, and Lombok annotations to reduce boilerplate code.
Can I generate test files?
Yes, you can include test files and README documentation with your generated POJOs for a complete project structure.
Is the generated code production-ready?
The generated code follows Java best practices with proper naming conventions, annotations, and structure suitable for production use.
How do I use the generated POJOs?
Simply copy the generated classes to your project and use them with your JSON processing libraries like Jackson or Gson for serialization and deserialization.