Paste an API response and get a Java POJO with getters, setters and Jackson annotations
Runs in your browser. Nothing you type is sent anywhere. Checked against sources on 16 Oct 2026.Reading an API response with Jackson needs a plain Java class for every object, with private fields, a getter and setter for each, and @JsonProperty wherever the key is spelled differently from the field. Paste the response and get one Root.java holding a nested static class per object, int, long or double chosen per field, and boxed types such as Integer wherever a value can be null.
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Java reads JSON into classes, usually with Jackson, and every object in the JSON needs a class whose fields have the right types and names. This converter writes those classes from a sample, so a long API response becomes compiling Java in one paste.
One file. The output is a single Root.java: the root class holds every other class as a public static nested class, which Jackson can create and which needs no extra files. When the JSON is an array or a single value, a comment names the type to read it as, such as List<Root.RootItem>.
Three styles. A POJO has private fields, getters and setters and works everywhere. A record (Java 16+) is short and immutable. Lombok @Data keeps the fields and lets Lombok write the rest.
The rest of the article, and all 6 questions about JSON to Java Class Converter, are on the JSON to Java Class Converter page.
Paste a JSON sample into the converter and the Java appears beside it: one Root.java with a nested static class for each object. Add Jackson to the project and read the JSON with new ObjectMapper().readValue(json, Root.class), which fills every field from its key.
Records, from Java 16, are the shortest and immutable, and Jackson 2.12 or later reads them directly. A POJO with getters and setters works on any Java version and with every library. Lombok's @Data writes the getters and setters for you at compile time, keeping the source short.
Jackson finds properties through getters, and it names getXCoord as xcoord by lowering the leading capitals. A field called xCoord would then not meet its own getter, and the property would split in two. The field is named xcoord, with @JsonProperty("xCoord") keeping the original key.
No. The conversion runs in your browser with no request to any server, and the JSON is not stored, so API responses holding tokens or personal data stay on your device. Close the tab and nothing remains.
Rates and rules change; check the source before you rely on a figure.
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Same job, other tools: TSV to JSON – Convert tab-separated values, such as a paste from Excel, into JSON · JSON to YAML – Turn JSON into clean, readable YAML for configs · Query String Parser – Split a URL query string into a table of decoded parameters.