Class or record
Classic POJOs with private fields, getters and setters, or compact Java 16+ records.
JSON to Java Class Generator
Create Java POJOs or records with Jackson annotations from example JSON.
Input
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Result
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Original (left)
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Modified (right)
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Differences
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About this tool
How the JSON to Java Class works
Generate Java POJOs with getters and setters, or Java records, from JSON. Jackson @JsonProperty for renamed keys and nested static classes.
How to use the JSON to Java Class
- Paste JSON.
- Choose class or record and set the root name.
- Copy the code into a .java file named after the root class.
JSON to Java Class example
{"id":7,"userName":"aarav","tags":["a"]}import java.util.List;
public record User(
Integer id,
String userName,
List<String> tags
) {}When to use it
- Mapping REST API responses in Spring Boot.
- Creating DTOs for request bodies.
- Typing JSON configuration in Java apps.
Tip: Records are immutable and need no getters, which makes them a good fit for DTOs on Java 16 and later.
Jackson-ready
Keys that are renamed for Java (user_name → userName) get @JsonProperty with the original key.
Nested types
Nested objects become public static nested classes or records in the same file.
Boxed types
Integer, Long, Double, Boolean and List<T> so missing values can be null.
FAQ
Common questions
Why boxed types instead of int?
JSON fields can be missing or null; Integer and Double can hold null where int cannot.
Which JSON library does it target?
Jackson, through @JsonProperty. Gson users can replace it with @SerializedName.
Are dates typed?
ISO date-times become OffsetDateTime and dates LocalDate; register Jackson's JavaTimeModule to deserialize them.
Is my JSON uploaded?
No, generation happens in your browser.
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