JSON to Java Classes

Generate Java classes or records from JSON examples online

Draft Java types from a representative JSON example. A sample cannot establish every nullable or optional field; review generated types and dependencies before compiling.

How to use it

Enter the source input or select Try example. Review Root type name, Java style, Jackson @JsonProperty annotations. Select Run tool and inspect the result before copying or downloading.

Options and example settings

Worked examples

Draft Java types from a representative JSON example.

Worked example — JSON to Java Classes

Settings: Root type name: User; Java style: POJO; Jackson @JsonProperty annotations: On

Input:

{"name":"Anna","age":25,"active":true,"address":{"city":"Tirana"},"tags":["user"]}

Output:

import java.util.List;
import com.fasterxml.jackson.annotation.JsonProperty;

class Address {
    @JsonProperty("city") private String city;

    public String getCity() { return city; }
    public void setCity(String city) { this.city = city; }
}

class User {
    @JsonProperty("name") private String name;
    @JsonProperty("age") private Long age;
    @JsonProperty("active") private Boolean active;
    @JsonProperty("address") private Address address;
    @JsonProperty("tags") private List<String> tags;

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
    public Long getAge() { return age; }
    public void setAge(Long age) { this.age = age; }
    public Boolean getActive() { return active; }
    public void setActive(Boolean active) { this.active = active; }
    public Address getAddress() { return address; }
    public void setAddress(Address address) { this.address = address; }
    public List<String> getTags() { return tags; }
    public void setTags(List<String> tags) { this.tags = tags; }
}

The example output has 28 lines. Compare its order, separators and whitespace with the input before copying the result.

Limitations and common mistakes

• A sample cannot establish every nullable or optional field; review generated types and dependencies before compiling.

Frequently asked questions

How can I create Java classes or records from JSON examples online?

Enter the source input or select Try example. Review Root type name, Java style, Jackson @JsonProperty annotations. Select Run tool and inspect the result before copying or downloading.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

Useful next tools

• JSON Formatter and Validator
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• JSON Tree Viewer
• JSONPath Tester