JSON to Java Converter

About this tool

Java model classes are verbose by nature: a field, a getter, a setter and an annotation for every property. For a response with thirty fields that is several hundred lines of code that nobody wants to type.

The generator produces either classic POJOs with accessors or Java records, and can attach Jackson, Gson or Lombok annotations. Nested objects become their own top-level classes so each one lives in its own file when you split the output.

How to use this tool

1. Paste your JSON sample.
2. Choose POJO with getters and setters, or a record.
3. Select the annotation style: none, Jackson, Gson or Lombok.
4. Press Generate, then copy each class into its own .java file.

Key features

• ✓Classic POJO with private fields and accessors, or a Java record
• ✓Jackson @JsonProperty, Gson @SerializedName or Lombok @Data annotations
• ✓Boxed types (Integer, Long, Double, Boolean) so null is representable
• ✓List<T> for arrays with element types unified
• ✓camelCase field names with the original JSON key preserved in the annotation
• ✓Java keywords and invalid identifiers renamed safely

Example

{"user_id":10,"active":true}

public class Root {
    @JsonProperty("user_id")
    private Integer userId;

    @JsonProperty("active")
    private Boolean active;

    public Integer getUserId() { return userId; }
    public void setUserId(Integer userId) { this.userId = userId; }

    public Boolean getActive() { return active; }
    public void setActive(Boolean active) { this.active = active; }
}

Good to know

• Each generated class needs its own file in a conventional Java project; the tool emits them in one buffer for you to split.
• No package declaration or imports beyond the annotation library are emitted, since the target package is project-specific.
• Records are immutable and have no setters — choose POJO output if you need mutability.

Frequently asked questions