JSON to Java Converter: Generate Java POJO Classes
The JSON to Java converter infers Java POJO classes from a JSON structure, so you can use JSON-shaped data in Java projects. Nested objects become nested classes, arrays become List<T>, and primitive values map to int, double, boolean, or String. Set a package name, choose getters/setters, or add Lombok @Data and Jackson @JsonProperty annotations before copying the result.
The JSON to Java converter infers Java POJO classes from the structure of your JSON input. Paste a JSON object to generate Java class definitions you can review and copy into your own code. The tool is useful when you need Java classes to represent data that is currently expressed as JSON.
The converter maps nested JSON objects to nested classes and arrays to List<T>. Primitive values map to int, double, boolean, or String. You can set a package name, choose whether to include getters/setters, and use Lombok @Data or Jackson @JsonProperty annotations. These options let you shape the generated Java output around your needs.
JSON represents data using objects, arrays, and values, while Java uses classes and types to describe data in code. Converting a JSON structure into POJOs can help when you need Java class definitions for JSON-shaped data, or when you want to inspect how a sample's fields and nested structures translate into Java. The generated result is ready to copy for use in your own workflow.
The conversion runs entirely in your browser. Your input is processed on your device and is not uploaded, stored, or sent to a server. After the page has loaded, the tool works offline without a server connection. It is free to use, making it useful for developers and DevOps engineers who need a quick way to generate Java classes from JSON.
Step 1: Paste your JSON input into the tool. It expects JSON and includes a worked example you can use as a starting point.
Step 2: Choose the options you need, such as a package name or getters/setters. You can also use Lombok @Data or Jackson @JsonProperty annotations.
Step 3: Review the generated Java classes. Nested objects become nested classes, while arrays are represented as List<T>.
Step 4: Copy the Java result into your project or wherever you need to use the generated classes.
Use case: Move JSON data into a system that only accepts Java by generating POJO classes that reflect the JSON structure.
Use case: Compare a Java value with its JSON original by generating classes that make the expected structure easier to inspect.
Use case: Prepare JSON examples for documentation, a ticket, or a commit message, then generate Java classes from the same structure.
Use case: Sanity-check a conversion before copying the generated result into your code.
Use case: Turn a JSON sample into a starting point for Java class definitions, including nested objects and list fields.
Use case: Create Java POJO classes with a chosen package name, getters/setters, or the available Lombok and Jackson annotations.