Generate Java POJOs and classes from JSON data structures
Need to convert Java into JSON Schema?
Document existing POJOs as JSON Schema for validation.
You can select both Jackson and Lombok
Enter JSON data to generate Java classes
Supports POJOs, Lombok, and Jackson annotations
Use this JSON to Java generator to create Java POJOs from JSON samples for Spring Boot apps, services, and JVM integrations.
Step 1 – Paste a JSON sample
Import to load JSON from a file, URL, or sample data.Step 2 – Choose Java POJO options
Class Name and Package Name to match your project structure.Jackson annotations if you want explicit JSON mappings.Lombok if you want to reduce boilerplate (getters/setters/constructors).Step 3 – Review the generated code
Root Type Name, null handling, and frameworks if available.Step 4 – Use the POJOs in Java
Step 5 – Copy or download
Quick tips
@JsonProperty when JSON keys don’t match Java naming.Instant/OffsetDateTime only when your timestamp format is stable.// JSON input
{
"id": 123,
"name": "Maeve Winters",
"email": "maeve@example.com",
"active": true,
"roles": ["admin", "editor"],
"metadata": { "plan": "pro" },
"createdAt": "2024-03-01T10:15:00Z",
"score": 99.5,
"notes": null
}
// Generated Java POJOs (simplified)
public class Metadata {
private String plan;
public String getPlan() { return plan; }
public void setPlan(String plan) { this.plan = plan; }
}
public class Root {
private int id;
private String name;
private String email;
private boolean active;
private java.util.List<String> roles;
private Metadata metadata;
private String createdAt;
private double score;
private Object notes;
}Explore more JSON and schema tools that work great alongside this JSON to Java generator.
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The generator creates Java classes with proper constructors, getters/setters, and supports Jackson annotations for JSON serialization, Lombok for boilerplate reduction, and standard Java conventions.
Yes! Select 'Lombok' as the framework to generate classes with @Data, @AllArgsConstructor, and @NoArgsConstructor annotations, eliminating boilerplate code.
When Jackson framework is selected, the generator adds @JsonProperty annotations to fields for proper JSON serialization/deserialization with custom property names.
You can specify custom package names in the options. The generator will add the appropriate package declaration at the top of the generated Java file.